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<title>Alexandrite Effect</title>
<description>Discuss alexandrite gemstones from the gallery and  all other types of natural color changing gemstones. Post pics from your collection.</description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-062</link>
<category domain="www.dmoz.org">Consumer Information/Jewelry and Gemstones</category>
<copyright>Copyright 2006-2008 Alexandrite.net</copyright>
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<lastBuildDate>Fri, 23 Sep 2011 12:37:38 +0200</lastBuildDate>
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<pubDate>Fri, 23 Sep 2011 12:37:38 +0200</pubDate>
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<item>
<title>I was told this was an alexandrite when given to me.</title>
<description><![CDATA[If I get it apraised and decide to sell it; where do i sell it?It is set on a unique setting i have never seen before. I have been looking on the net for the same kind of setting and cant find one that is similar to mine. seems like an 8 pointer star and the alexandrite is oval i think. any info or like to say anything feel free to. Thanks   ]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-424</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-424</guid>
<author>Delilah</author>
<pubDate>Thu,  9 Jun 2011 03:01:22 +0200</pubDate>
</item>
<item>
<title>Re: Alexandrite of Brésilia</title>
<description><![CDATA[
Hi Chris,
You can contact David Wein jewelers. They have an office in Bangkok, Thailand and they specialize in alexandrite jewelry.  They also buy and sell loose alexandrite gemstones online.
Good luck.
Hello Mr. Vesseloski ...do you think that will be preferable to have both with me and go to the Japan with ? for some collectors or which way will be my best move...I have now the time to go at Silom 20 and I will be back to you...thank you again...
Chris
Hello again Mr. vesselovski...I saw Mr. David Weinberg this morning; and he cannot say about my gemstone if is real or not so my next step is to go at laboratory he said...so we are in front mysterious stone an excellent copy or very beautiful natural stone ??? We will see...
The story will continue after tomorrow...
Regards,
Chris]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-414-00004</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-414-00004</guid>
<author>Alexandrite du Brésil</author>
<pubDate>Wed, 19 Jan 2011 06:25:41 +0100</pubDate>
</item>
<item>
<title>Re: Alexandrite of Brésilia</title>
<description><![CDATA[
Hi Chris,
You can contact David Wein jewelers. They have an office in Bangkok, Thailand and they specialize in alexandrite jewelry.  They also buy and sell loose alexandrite gemstones online.
Good luck.
Hello Mr. Vesseloski ...do you think that will be preferable to have both with me and go to the Japan with ? for some collectors or which way will be my best move...I have now the time to go at Silom 20 and I will be back to you...thank you again...
Chris]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-414-00003</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-414-00003</guid>
<author>Alexandrite du Brésil</author>
<pubDate>Wed, 19 Jan 2011 01:43:50 +0100</pubDate>
</item>
<item>
<title>Re: Alexandrite of Brésilia</title>
<description><![CDATA[
Hi Chris,
You can contact David Wein jewelers. They have an office in Bangkok, Thailand and they specialize in alexandrite jewelry.  They also buy and sell loose alexandrite gemstones online.
Good luck.
Yes Thank so lot I have been to see him at Silom 20, soi Pradit 59; but that was not open and today I will go again; also I found another place here for to have certification of this gemstone so much reactive at the différent light ....so that is GERMOLOGICAL RESEARCH AND TESTING BUILDING, at Bangkok...
I will start with Mr. David Weinberg first and thank you again...! ]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-414-00002</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-414-00002</guid>
<author>Alexandrite du Brésil</author>
<pubDate>Tue, 18 Jan 2011 01:08:33 +0100</pubDate>
</item>
<item>
<title>Alexandrite of Brésilia</title>
<description><![CDATA[Hi Chris,
You can contact David Wein jewelers. They have an office in Bangkok, Thailand and they specialize in alexandrite jewelry.  They also buy and sell loose alexandrite gemstones online.
Good luck.]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-414-00001</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-414-00001</guid>
<author>Andrei Vesselovski</author>
<pubDate>Mon, 17 Jan 2011 21:25:00 +0100</pubDate>
</item>
<item>
<title>Alexandrite of Brésilia aproximatively 14 carats with another one half smaller of same crystal !!!</title>
<description><![CDATA[Hi everybody,
I would like to know how much am lucky ?; My dead grandfather gave to me in succession a natural stone from Brésilia, and nobody inside my large family knows about these rings; I mean my grandmother still alive at 90 years old now and she got the version of woman ring with her; but me I have the one of my grandfather.
Also am in Thaïland now and I have with me this fabulous gemstone...the other one still in Canada...so if I would like to sell these two rings which same original crystal stone, am asking me if am better to sold them both together ?
If somebody have an idea frome these two natural Alexandrite of Brésilia; I would like to talk anymore with and please come back to me for to have a conversation,
Thanks for all to take a time to read me
Chris]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-414</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-414</guid>
<author>Alexandrite du Brésil</author>
<pubDate>Sun, 16 Jan 2011 10:44:24 +0100</pubDate>
</item>
<item>
<title>Alexandrite Specimens</title>
<description><![CDATA[I have 6 stones that I seem to be battling to get valued. They are not cuttable as far as the jeweller is concerned but could be good for collectors. They are from the Novello Claims in Zimbabwe and I have no idea where to start getting a value from someone that knows or collects these stones - any ideas?]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-373</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-373</guid>
<author>Grant Pietersen</author>
<pubDate>Thu,  7 Oct 2010 13:55:54 +0200</pubDate>
</item>
<item>
<title>Alexandrite Specimens for collectors</title>
<description><![CDATA[I have 6 stones that I seem to be battling to get valued and i would like to sell. They are not cuttable as far as the jeweller is concerned but could be good for collectors. They are from the Novello Claims in Zimbabwe and I have no idea where to start getting a value from someone that knows or collects these stones, could someone give me some ideas?]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-372</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-372</guid>
<author>Grant Pietersen</author>
<pubDate>Thu,  7 Oct 2010 13:53:46 +0200</pubDate>
</item>
<item>
<title>Re: Browse gemstones tagged with color change gemstone</title>
<description><![CDATA[Here you go - two natural Alexandrite marquises. One from Andrapradesh, India and another from Tunduru, Tanzania.
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-355-00001</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-355-00001</guid>
<author>Paulo Cruz</author>
<pubDate>Sat, 30 Jan 2010 01:24:06 +0100</pubDate>
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</item>
<item>
<title>Browse gemstones tagged with color change gemstone</title>
<description><![CDATA[beautiful, but am looking for marquise cut]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-355</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-355</guid>
<author>beadin_eagle@yahoo.com</author>
<pubDate>Sat,  9 Jan 2010 15:40:33 +0100</pubDate>
</item>
<item>
<title>Natural Alexandrite Pear 7.24 cts</title>
<description><![CDATA[I was browsing your site about Alexandrite stones. 30yes ago I was in Greece and purchased two rings beautiful mounted in 18k gold spiral basket/cage. I was told they were Alexandrite stones but that was irrevelant at the time. I just liked the way they changed in color. Mine are VERY similar to the one above. the pear is around 8cts and the oblong around 9cts. Had then looked at 25yrs ago but this guy wasn't really sure if they were Alexandrite or not. They were apprased around $8-900.00 then. I would liked to have them apprased again but do not know any one reputable here in Albuquerque,NM  ]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-354</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-354</guid>
<author>amhrnrf@cableone.net</author>
<pubDate>Mon, 21 Dec 2009 01:39:49 +0100</pubDate>
</item>
<item>
<title>Causes of color change in malaia and color changing garnets</title>
<description><![CDATA[Malaia is name given to garnets orange to pinkish orange to red in color which do not match the color and gemological properties of any of the other more well known varieties of garnet. (Some authors spell it Malaya garnet).
Indeed, the word malaia means prostitute or out of the family in Swahili. Primarily composed of spessartite
and pyrope, the color and gemological properties occur in a range which can overlap with grossularite, rhodolite, and pyrope.
Some of them may change color under daylight and incandescent lighting and these stones are more commonly and collectively known as Color Change Garnets. It is thought that the color change is due to the presence of vanadium or chromium in trace amounts. Our own observations indicate that color change could also be influenced by the needle like inclusions of rutile or actinolite which are common in the color changing stones but less apparent in the stones that don’t change color.
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-342-00003</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-342-00003</guid>
<author>David Weinberg</author>
<pubDate>Thu,  9 Apr 2009 09:55:00 +0200</pubDate>
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</item>
<item>
<title>Colour change garnet, Malaia garnet and malaya garnet</title>
<description><![CDATA[But what causes the garnet colour change - is it the alexandrite effect? For instrance - malaia garnet, malaya garnet and color change garnet are all a mixture of pyrope and spessartite so what's the difference? Why malaia garnet doesn't change colour?
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-342-00002</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-342-00002</guid>
<author>Marisa Spano</author>
<pubDate>Wed,  8 Apr 2009 09:21:00 +0200</pubDate>
</item>
<item>
<title>Colour change garnet vs Alexandrite</title>
<description><![CDATA[Faceted alexandrites and color change garnets  can occur in wide range of colors that are a function of chemistry and crystallographic orientation, it is impossible to describe color change in anything but generalized terms.
However, our experiences photographing and grading both kinds of stones in a variety of light conditions suggest that color change garnet is usually more sensitive to color changes in the higher ranges of daylight above 4500 K. Whether in morning or afternoon daylight and with or without sunlight, alexandrite color is fairly constant and only shows a dramatic change under incandescent light.
Color change garnets on the other hand, often show a significant change between 4500K daylight and 6500K cool daylight (fluorescent light). Indeed some of the color change garnets especially from the new deposit in Chavia, Kenya have been referred to has tri color garnets because of their larger color change range. To appreciate the full range of colors in these stones we need to view them under incandescent, natural daylight, and fluorescent light. Without viewing the stones under every kind of light it will impossible to appreciate the full range of colors.
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-342-00001</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-342-00001</guid>
<author>David Weinberg</author>
<pubDate>Tue,  7 Apr 2009 10:48:00 +0200</pubDate>
<enclosure type="image/jpeg" url="http://www.alexandrite.net/assets/images/attachments/35006/color change garnet_zcg1006ah.jpg" length="65471"/>
</item>
<item>
<title>Colour change garnet</title>
<description><![CDATA[I want to know more about colour change garnets. From all the comments I have read, I understood that the colour change in garnet is supposed to occur between morning and late afternoon light, which is not the same as with alexandrite color change phenomena which  cause colour change depending on daylight and incandescent light. Does it mean that garnets will not change colour under an incandescent light bulb?
What causes the garnet colour change? Is it the alexandrite effect or some other optical phenomena, like the Usambara effect for colour changing tourmalines?
I saw brown to red and greenish to reddish colour change. But garnets come in all kind of colours - pink, red, purple, orange, yellow, violet, green and even colourless. What kind of other colour change in garnets exist?]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-342</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-342</guid>
<author>liska397</author>
<pubDate>Sun,  5 Apr 2009 14:17:20 +0200</pubDate>
</item>
<item>
<title>Colour change  not quite the same thing as pleochroism</title>
<description><![CDATA[Kunzite is famous for its strong pleochroism, showing lighter and more intense coloring when viewed at different angles. It will display intense color variations and color difference when viewed from the top and bottom. It can even display multiple colors or appear colorless.
Kunzite is trichroic, which means that three colors can be viewed from differing angles: pink, clear and violet. Sometimes the color change is limited to shade changes, such as from pale pink to dark pink.
However, when speaking of color changing gemstones, the ability to change color depends on the type of light. A gemstone might look green in sunlight, but red in incandescent lighting. Not quite the same thing, as pleochroism, which involves the same light, but different angles.
In conclusion: Kunzite is not a color changing gemstone
Dominica
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-336-00002</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-336-00002</guid>
<author>Dominica Lachance</author>
<pubDate>Wed,  1 Apr 2009 16:03:00 +0200</pubDate>
</item>
<item>
<title> Kunzite - pleochroism and color-fading effect</title>
<description><![CDATA[Kunzite is known for its strong pleochroism showing lighter and more intense coloring in different directions. For this reason, it is always cut to show the deepest pink color through the table of the stone. The deeper darker and more saturated colors of kunzite are considered to be the most valuable.
Kunzite may fade in strong light. Some deep pink stones have turned nearly colorless from fading. Although the color-fading effect is not this drastic in most kunzite, it is still important not to expose kunzite gems to strong light (especially sunlight) for long periods. Kunzite is sometimes called "evening stone" for this reason. The color of some kunzite can be restored or intensified by irradiation.
DW]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-336-00001</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-336-00001</guid>
<author>David Weinberg</author>
<pubDate>Wed,  1 Apr 2009 14:54:00 +0200</pubDate>
</item>
<item>
<title>Colour changing Kunzite?</title>
<description><![CDATA[I was looking for a large kunzite for my gemstone collection. Once I asked a seller to send me extra photos, I received the pictures where kunzite is shown in different colours, before and after light exposure.
Does it mean that kunzite can change colour?
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-336</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-336</guid>
<author>liska397</author>
<pubDate>Wed,  1 Apr 2009 14:41:00 +0200</pubDate>
<enclosure type="image/jpeg" url="http://www.alexandrite.net/assets/images/attachments/34945/kunzite_color_change.jpg" length="97795"/>
</item>
<item>
<title>Color change natural tourmaline</title>
<description><![CDATA[Fairly large (12.7ct) color changing natural tourmaline from Africa (Kenya?). Color changes from slightly dark  green in natural daylight to an intence orange with red flashes under incandescent  light.
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-282-00006</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-282-00006</guid>
<author>Michael Vanevski</author>
<pubDate>Fri, 20 Mar 2009 01:13:00 +0100</pubDate>
<enclosure type="image/jpeg" url="http://www.alexandrite.net/assets/images/attachments/34765/color-change-tourmaline.jpg" length="155092"/>
</item>
<item>
<title>Devil stone?</title>
<description><![CDATA[We have one color change zircon. In the dark gemstone change its color to bright red, when expose to light the color will get darker to deep brown. Very unusual and beautiful.
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-282-00004</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-282-00004</guid>
<author>icgems.com</author>
<pubDate>Mon, 16 Mar 2009 03:43:00 +0100</pubDate>
<enclosure type="image/jpeg" url="http://www.alexandrite.net/assets/images/attachments/34692/b_ZIRS0058.jpg" length="20250"/>
</item>
<item>
<title>Colour change sapphire anyone?</title>
<description><![CDATA[Some amazing  colour change sapphire. Changes colour from dark violet to  very nice blue.
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-282-00005</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-282-00005</guid>
<author>Marisa Spano</author>
<pubDate>Sun, 26 Oct 2008 14:01:00 +0100</pubDate>
<enclosure type="image/jpeg" url="http://www.alexandrite.net/assets/images/attachments/34696/color-change-sapphire.jpg" length="29517"/>
</item>
<item>
<title>Red color change garnet</title>
<description><![CDATA[Strong color change  from brown to red in natural garnet
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-282-00003</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-282-00003</guid>
<author>Michael Vanevski</author>
<pubDate>Tue, 16 Sep 2008 03:21:00 +0200</pubDate>
<enclosure type="image/jpeg" url="http://www.alexandrite.net/assets/images/attachments/34689/red-color-change-garnet.jpg" length="38499"/>
</item>
<item>
<title>Re: Emerald Cut Alexandrite, 12.53 ct</title>
<description><![CDATA[
And also for those that know... how do I know if mine is lab grown or natural?
To be 100% sure, you need to get an identification report from the respectful gem lab.
< http://www.alexandrite.net/directory/laboratories-WRC-050.html >
Also, you can read chapter "Alexandrite Synthetics and Imitations"
<  http://www.alexandrite.net/chapters/chapter7/index.html >]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-173-00002</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-173-00002</guid>
<author>John Sinth</author>
<pubDate>Fri,  7 Sep 2007 18:10:51 +0200</pubDate>
</item>
<item>
<title>Re: Emerald Cut Alexandrite, 12.53 ct</title>
<description><![CDATA[If your Alexandrite is natural, then the price will depend on many factors, such as color, clarity, color change strength, origin, etc.  It's not very common to use emerald cut ( baguette shape) for natural alexandrite, because fine Alexandrite are very expensive and gem dealer/cutter will try to save as much weight as possible, especially for large stones ( above 5cts).
So, assuming that you have 12.53cts natural alexandrite with strong color change, it can cost anything between $7.000 to $50.000.]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-173-00001</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-173-00001</guid>
<author>David Weinberg</author>
<pubDate>Fri,  7 Sep 2007 18:04:01 +0200</pubDate>
</item>
<item>
<title>Emerald Cut Alexandrite, 12.53 ct</title>
<description><![CDATA[Hi everyone!
I recently (today!) got from my mom a really nice emerald cut Alexandrite. It was set in a ring she inherited and she wanted to use the gold so I asked her if she would give me the stone, which I didnt know what it was. It is a very nice one and it goes from a deep blue green/violet to a bright red wine color.
According to the measurements and this site http://www.csgnetwork.com/caratwtcalc.html it says its 12.53 carat. I've seen some sites where some of these go for very high prices
So now Im curious as to how much could my stone go for? And if people actually pay those prices...
And also for those that know... how do I know if mine is lab grown or natural?]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-173</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-173</guid>
<author>cristiamador</author>
<pubDate>Thu, 30 Aug 2007 01:30:55 +0200</pubDate>
</item>
<item>
<title>Useful tool for beginners</title>
<description><![CDATA[A dedicated Alexandrite search engine can be found at http://alexandrite-gemstone-swicki.eurekster.com/.
I found this useful for getting some background information on Alexandrite]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-172</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-172</guid>
<author>gemboy</author>
<pubDate>Mon, 27 Aug 2007 11:30:09 +0200</pubDate>
</item>
<item>
<title>Looking for a alexandrite</title>
<description><![CDATA[Hello,
I've noticed that most of your alexandrites are from multicolour.com. Some time ago
I've seen one alexandrite there, I saved a picture of it, but now I can not find it any more.
Maybe you could help me to locate it.
Thank you.
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-133</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-133</guid>
<author>natyk</author>
<pubDate>Thu,  2 Aug 2007 15:53:00 +0200</pubDate>
</item>
<item>
<title>Re: Are there any other gemstones which change color?</title>
<description><![CDATA[Bastnasite, which is sometimes spelled as bastnaesite, is one of a few rare earth carbonate minerals and change color as well. Bastnasite gets its name from its type locality, Bastnas Mine, Riddarhyttan, Vastmanland, Sweden.
See interesting color change from orangy yellow to  yellowish orange:
Although a scarce mineral and never in great concentrations, it is wide spread and one of the more common rare earth carbonates. Bastnasite has been found in karst bauxite deposits in Hungary, Greece and the Balkans]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-282-00002</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-282-00002</guid>
<author>Paulo Cruz</author>
<pubDate>Thu, 26 Jul 2007 13:09:00 +0200</pubDate>
<enclosure type="image/jpeg" url="http://www.alexandrite.net/assets/images/attachments/34686/natural-bastnasite.jpg" length="29553"/>
</item>
<item>
<title>Re: Are there any other gemstones which change color?</title>
<description><![CDATA[Some excellent color change oval garnet. Looks like a top alexandrite at a fraction of the price.
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-282-00001</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-282-00001</guid>
<author>Dominica Lachance</author>
<pubDate>Mon, 11 Jun 2007 03:03:00 +0200</pubDate>
<enclosure type="image/jpeg" url="http://www.alexandrite.net/assets/images/attachments/34683/color-change-garnet.jpg" length="30236"/>
</item>
<item>
<title>What  gemstones  change color like alexandrite?</title>
<description><![CDATA[Several other well known gemstones, including diaspore, sapphire, garnet and spinel may also change color as a function of the light source but the color change of top alexandrites is distinctive and attractive under any light conditions.
Spinels sometimes show a blue to violet color change but the change is usually weak and the stones never look like alexandrite. Turkish diaspore is being sold under the name of Zultanite and higher quality versions of this stone shift from varying shades of green in daylight to a pinkish brown under incandescent light. Only sapphires and garnets can show any real resemblance to alexandrite.
Color change sapphire
Color change sapphires are basically known to occur in two types; the ones that change from blue to purple and the ones that change from green to red. The stones that change from green to red are the ones that can be confused with alexandrite and they only occur at the deposit in Songea, Tanzania.
Although the daylight colors are usually somewhat muddy, they can be very red under incandescent light and do look similar to some of the alexandrites from the same country. Because of their similarity to alexandrites, they are referred to as alex type sapphires in Japan.
However, it is the color change garnets especially the ones from Bekily in Madagascar that most resemble alexandrite. The stones are actually a mixture of pyrope and spessartite and can show several colors depending on the light source.
Color change garnet
Although they look a lot like alexandrites they are different because they change color throughout the day. They are green or blue grey in the early morning and reddish in the late afternoon or in strong sunlight. Some of the stones are almost blue especially under fluorescent light but most of them are grey blue or green in daylight and change to red under incandescent or late afternoon light. The stones can show an excellent color change and can easily be confused with alexandrite.
Without gemological tests, the stones can be distinguished from alexandrites by the needle like inclusions that are common in them or by the way the stones change color according to the time of day. Although they look like alexandrites, these Bekily garnets will appear red in the afternoon while the alexandrites remain green. Garnets from other parts of East Africa also change color but as they normally change from brown or orange to red, they don´t look much like alexandrite.]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-282</link>
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<author>Dominica Lachance</author>
<pubDate>Fri, 16 Mar 2007 01:59:00 +0100</pubDate>
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<enclosure type="image/jpeg" url="http://www.alexandrite.net/assets/images/attachments/34679/color_change_sapphire.jpg" length="30800"/>
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<title> is my alexandrite real?</title>
<description><![CDATA[Rina,
Theoretically, your stone could be a natural alexandrite. However, 13x11 is a very large size for a natural alexandrite so I am doubtful. If you want to know for sure, send the stone to a qualified and experienced gemologist.]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-168-00005</link>
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<author>David Weinberg</author>
<pubDate>Sun, 24 Dec 2006 22:28:59 +0100</pubDate>
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<title> How about some preview?</title>
<description><![CDATA[Hi Michelle,
Can you post link to the picture ( photo) of your ring?
Thanks
J.G
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-169-00002</link>
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<author>Anonymous</author>
<pubDate>Fri, 22 Dec 2006 16:57:23 +0100</pubDate>
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<title>Step Cut Alexandrite Oval, 5.16 cts</title>
<description><![CDATA[Looking to purchase?  How about a perfectly natural octagon alexandrite, in its original platinum ring setting?  Measurments are 15mm x 11mm.  There is no red in this stone.  Strictly green/aqua/violet.  Color change is dramatic not only in indoor/outdoor settings, but from direct/indirect sunlight as well.  If you are interested, contact me at the e-mail below.
Michelle Gayle]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-169</link>
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<author>Anonymous</author>
<pubDate>Fri, 22 Dec 2006 16:50:53 +0100</pubDate>
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<title> Alexandrite from India</title>
<description><![CDATA[P.S. The stone has a Portuguese Cut, not step cut as I mentioned before. ]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-168-00004</link>
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<author>Anonymous</author>
<pubDate>Wed, 29 Nov 2006 09:50:10 +0100</pubDate>
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<title> Alexandrite from India</title>
<description><![CDATA[Hi Andrei!
I would like to know if there is a theoretical possibility, what the gem I have is a natural alexandrite.
The gem was a gift from Russian woman who lived in India for 30 years (1932-1962 approximately). As far as I know stone was purchased there.
The stone was presented to my family at 1972.
It is an oval step cut, size - 13 x 11 mm, eye clean. The color changes from medium dark green blue or blue green in cool daylight to medium reddish purple in incandescent light.
Thanks in advance,
Rina]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-168-00003</link>
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<author>Anonymous</author>
<pubDate>Tue, 28 Nov 2006 19:15:29 +0100</pubDate>
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<title> alexandrite for sale</title>
<description><![CDATA[Most of alexandrite gemstones here come  from the Multicolour Gems Ltd collection. If you want to buy alexandrite,  you can visit  Multicolour Gems  website:
http://www.multicolour.com/gallery/?/gallery/alexandrite/
Best Regards
Andrei]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-168-00002</link>
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<author>Andrei Vesselovski</author>
<pubDate>Mon, 27 Nov 2006 08:25:20 +0100</pubDate>
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<title>Portuguese Cut Alexandrite Round, 1.19 cts</title>
<description><![CDATA[I am wondering if the stones shown are for sale, specifically ref # YAX502aa, a faceted alexandrite 1.19 cts. 6x6 mm. If so, what is it being sold for.  I am looking for a beautiful stone for a wedding ring and think this is it!  It is also my daughters birthstone so it would make a fabulous heirloom.  Thank you for your time. Rebecca
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-168</link>
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<author>Anonymous</author>
<pubDate>Mon, 27 Nov 2006 08:03:34 +0100</pubDate>
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<title> color grading alexandrite</title>
<description><![CDATA[There are no international standards to  grade the strength of color change in alexandrite and the better labs may use master stones to grade the strength of a color change. Most labs use something like strong, moderate, or weak to describe the strength of a color change. For color grading, the GIA system is the most convenient and they offer a program called something like gem Ewizard that is useful. There is some variation as a function of the monitor you are using. Although the system is not perfect, it is the best practical system to grade colored gemstones and we use it. ]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-167-00002</link>
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<author>David Weinberg</author>
<pubDate>Mon, 27 Nov 2006 06:12:12 +0100</pubDate>
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<title> Alexandrite idenitifcation</title>
<description><![CDATA[Hi
How can I find out more about this stone and be sure its not a synthetic?
Hello Richard,
Most gemstones described as synthetic alexandrite are actually synthetic corundum laced with vanadium to produce the color change. This Alexandrite like sapphire material has been around for almost 100 years. The material shows a characteristic purple-mauve colour change. The stones will be very clean and may be available in large sizes. Gemological testing will reveal a refractive index of 1.759 - 1.778 (corundum) instead of 1.741 - 1.760 (chrysoberyl). Under magnification, gas bubbles and curved stria may be evident. When examined with a spectroscope a strong vanadium absorption line at 475 nm will be apparent.
However, the most assured way to  find out if you have genuine alexandrite is to submit your stone for testing to the Gemological Laboratory. Here some links:
American Gem Registry, Inc.  http://www.gemlab.us/
American Gem Society Laboratories http://www.agslab.com
Asian Institute of Gemological Sciences  http://www.aigsthailand.com/
European Gemological Laboratory USA http://www.eglusa.com/
GemResearch Swisslab http://www.gemresearch.ch/
Gubelin Gemmological Laboratories  http://www.gubelinlab.com/
Russian Gemological Server  http://www.gemology.ru/
Gem Testing Laboratory of Great Britian http://gem-a.com/
Best Regards
Andrei Vesselovski]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-165-00005</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-165-00005</guid>
<author>Andrei Vesselovski</author>
<pubDate>Tue, 21 Nov 2006 21:09:15 +0100</pubDate>
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<title> YAX407aa</title>
<description><![CDATA[Hi
I believe I have exactly the same stone (size and cut) mounted in a 22 caret Gold ring, the style of the ring is late 1800's early 1900's.
This ring was given to my Mother in Law (my wife is Latvian) by and old lady in Latvia (Former USSR) Interestingly when the Item was purchased originally Latvia would have been independent but with strong trade links with Russia.
The old lady told my mother in law that she was given the ring in around 1900.
The ring is hallmarked.
The gem appears  purple in artificial light and  light blue in day light
How can I find out more about this stone and be sure its not a synthetic?
Thanks Richard]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-165-00004</link>
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<author>Anonymous</author>
<pubDate>Tue, 21 Nov 2006 16:18:51 +0100</pubDate>
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<title>Grading a color change gems?</title>
<description><![CDATA[Hello everybody,
I am looking for the color grading manual. How do you describe alexandrite colors? Are there any  grading specifics or rules? How  should I evaluate alexandrite color change?
Thank you
David
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-167</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-167</guid>
<author>Anonymous</author>
<pubDate>Sun, 12 Nov 2006 15:22:26 +0100</pubDate>
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<title> alexandrite prices</title>
<description><![CDATA[You can see the prices of most of these alexandrites at the multicolour.com website.
http://www.multicolour.com
or
http://www.multicolour.com/gallery/?/gallery/single/alexandrite/]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-166-00003</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-166-00003</guid>
<author>David Weinberg</author>
<pubDate>Wed, 25 Oct 2006 14:31:55 +0200</pubDate>
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<title> price discussion</title>
<description><![CDATA[Please contact the folks at multicolour.com, info@multicolour.com for more information about this stone. The multicolour website lists many alexandrites with prices so you can get and idea about that. You can also search other websites to get an idea about prices. Website prices are mostly below retail. You can also try to compare with prices at gem shows and jewelry stores. For an independent appraisal, the stone should be submitted to an experienced gemologist and you might be able to find one in your area. The top gemlabs only do identifications, not appraisals.]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-165-00003</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-165-00003</guid>
<author>David Weinberg</author>
<pubDate>Sat, 23 Sep 2006 17:32:56 +0200</pubDate>
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<title> Pricing</title>
<description><![CDATA[Just wondering what this stone is worth and how to get a reliable apraisal on such a stone?
Gary Rhoads]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-165-00002</link>
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<author>Anonymous</author>
<pubDate>Fri, 22 Sep 2006 00:13:41 +0200</pubDate>
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<title>Step Cut Alexandrite Oval, 2.6 cts</title>
<description><![CDATA[Hi,
This alexandrite photograph and specification is the courtesy of Multicolour.com.  I believe it is for sale at:
&amp;lt;http://www.multicolour.com/detail/index.html?-617565681 &amp;gt;  for $13.665.
As for the  independent ( not sure about how reliable) appraisal you can try &amp;lt; http://www.gemval.com/&amp;gt;, although  it will be based  exclusively on the web prices.
Best regards
Andrei
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-165</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-165</guid>
<author>Andrei Vesselovski</author>
<pubDate>Fri, 22 Sep 2006 00:13:40 +0200</pubDate>
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<title> Alexandrite values</title>
<description><![CDATA[Hi Lisa,
This is a non commercial website so there are no prices for now. I you would like to check prices, please go to:
http://www.multicolour.com/gemstones/alexandrite.html]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-166-00001</link>
<guid isPermaLink="true">http://www.alexandrite.net/viewpage.html?id=FRM-166-00001</guid>
<author>David Weinberg</author>
<pubDate>Tue,  5 Sep 2006 09:33:15 +0200</pubDate>
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<title> Cymaphane, cymophane, cats eye</title>
<description><![CDATA[The common trade name for chatoyant chrysoberyl is cat's eye.  or chrysoberyl cat's eye. Chrysoberyl can be chatoyant but not opalescent. Other cat's eyes like tourmaline or kornerupine should be reffered to as tourmaline cat's eye or kornerupine cat's eye respectively while chatoyant chrysoberyls can be designated as cat's eyes without the species name. Cymophane is another name for chatoyant chrysoberyl but is rarely used in the trade.]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-164-00002</link>
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<author>David Weinberg</author>
<pubDate>Sun,  3 Sep 2006 10:46:10 +0200</pubDate>
</item>
<item>
<title>Cymophane or Cats eye?</title>
<description><![CDATA[Hello,
I know of at least 7 terms used to call an opalescent variety of chrysoberyl, which are: Chrysoberyl Cat's-eye, Cymophane, Cymophanit, Cymophanita, Cymophanite, Cats eye and Cat's eye.
Which one should I used, why and where?
Thanks
Chris
]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-164</link>
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<author>Anonymous</author>
<pubDate>Sun,  3 Sep 2006 09:58:29 +0200</pubDate>
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<title>Step Cut Alexandrite Oval, 3.03 cts</title>
<description><![CDATA[Hi,
Great site, beautiful stones, but why you don't publish stones value? I think without price tag it's very hard to judge if stone is rare or "good".
Lisa]]></description>
<link>http://www.alexandrite.net/viewpage.html?id=FRM-166</link>
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<author>Anonymous</author>
<pubDate>Sat,  2 Sep 2006 03:07:46 +0200</pubDate>
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