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Alexandrite

Tsarstone collectors guide

Alexandrite guide forums

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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.
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
Topic page 1 of 1
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Bibliographic details
Page title Grading a color change gems?
Author Anonymous
Website title Alexandrite Tsarstone Collectors Guide
Date published 12 November 2006 15:22 UTC
Date accessed 18 April 2014 20:10 UTC
Permanent link http://www.alexandrite.net/viewpage.html?id=FRM-167
AMA style
Anonymous. "Grading a color change gems?". In Alexandrite Tsarstone Collectors Guide. November 12, 2006, 15:22 UTC. Available at: http://www.alexandrite.net/viewpage.html?id=FRM-167. Accessed April 18, 2014.
APA style
"Grading a color change gems?". (2006, November 12). In Alexandrite Tsarstone Collectors Guide. Retrieved 20:10, April 18, 2014, from http://www.alexandrite.net/viewpage.html?id=FRM-167.
Bluebook style
"Grading a color change gems?", http://www.alexandrite.net/viewpage.html?id=FRM-167 (last visited April 18, 2014).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Grading a color change gems?", http://www.alexandrite.net/viewpage.html?id=FRM-167 ( How do you grade alexandrites ?) (as of Apr. 18, 2014, 20:10 GMT).
CBE/CSE style
Anonymous. "Grading a color change gems?". In Alexandrite Tsarstone Collectors Guide. 2006 Nov 12, 15:22 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2006 Nov 12, 15:22 UTC [cited 2014 Apr 18]. Available from: http://www.alexandrite.net/viewpage.html?id=FRM-167.
Chicago style
Anonymous, "Grading a color change gems?", http://www.alexandrite.net/viewpage.html?id=FRM-167, (accessed April 18, 2014).
MLA style
"Grading a color change gems?". Alexandrite Tsarstone Collectors Guide. 12 Nov 2006, 15:22 UTC. 18 Apr 2014 http://www.alexandrite.net/viewpage.html?id=FRM-167
MHRA style
Anonymous, "Grading a color change gems?", Alexandrite Tsarstone Collectors Guide, 12 November 2006, 15:22 UTC, http://www.alexandrite.net/viewpage.html?id=FRM-167 [accessed 18 April 2014].
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