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Tsarstone collectors guide

gemstone identification

1. Gubelin Gemological Laboratories
Dr. Eduard J. Gubelin, one of the forefathers of modern gemology, and who was a Founding Organizing Member as well as an Honorary Member of the International Colored Gemstone Association (ICA), passed away in Lucerne, Switzerland in March at the age of 91
HTML, 66 Kb, 2009-03-15 03:05:18
2. American Gemological Laboratories
American Gemological Laboratories is a unit of Collectors Universe, the leading provider of value-added authentication and grading services for high-value collectibles and gemstones, which was founded in 1986 and publicly traded since 1999. In 1977, Ameri
HTML, 65 Kb, 2009-03-15 03:14:21
3. AGTA Gemological Testing Center
The AGTA Gemological Testing Center is the natural coloured gemstone industry’s premier independent laboratory providing the industry and the public with a complete range of services, including gemstone identification, origin determination and pearl ide
HTML, 65 Kb, 2009-03-15 03:11:40
4. Gemmological Association of Great Britain
Gem-A, which began as a Gemmological Committee of the National Association of Goldsmiths, first introduced a gemmology qualification in 1908 in order to encourage jewelers to understand the gems they were selling and to identify the fakes.
HTML, 65 Kb, 2009-03-15 03:22:40
5. AIGS Gemological Laboratory
First professional gemological laboratory to be established in Asia in 19978, - The AIGS Gemological Laboratory is a private, independent gemological laboratory, member of the Thai Gem and Jewelry Traders Association (TGJTA), and The International Colored
HTML, 65 Kb, 2009-03-15 02:39:58
6. Zenhokyo
Leading gemmological educational institution in Japan has been providing professional education in the field for the past 30 years. Zenhokyo Laboratory is equipped with the most professional and advanced testing devices and systems, including inductive
HTML, 65 Kb, 2009-03-15 02:29:48
7. Gemological Institute of America
GIA is considered the world's most trusted name in diamond grading and gemstone identification. GIA’s D-to-Z colour-grading scale and Flawless-to-I3 clarity-grading scale are recognized by gem and jewellery professionals everywhere. And, by extension, t
HTML, 65 Kb, 2009-03-15 03:18:30
SSEF laboratory offers analysis of precious stones and issue test reports for diamonds, coloured stones and pearls. It was recognized in 1978 by the International Confederation of Jewellers and Goldsmiths (CIBJO and also a member of the International Colo
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9. The Gem and Jewelry Institute of Thailand
IT Gem Testing Laboratory (GIT-GTL), has been accredited by The World Jewellery Confederation (CIBJO) as the CIBJO Registered Laboratory since May 2000.
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10. Hong Kong Gems Laboratory
Established in 1987, Hong Kong Gems Laboratory is well equipped and recognized by gemologists and industry professionals. Full-service lab offers FTIR spectrophotometerservice, which provides evidence for jadeite jade and diamond, corundum, emerald and ot
HTML, 65 Kb, 2009-03-15 02:25:21
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Bibliographic details
Page title gemstone identification
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 16 December 2017 07:23 UTC
Date accessed 16 December 2017 07:23 UTC
Permanent link
AMA style
David Weinberg. "gemstone identification". In Alexandrite Tsarstone Collectors Guide. December 16, 2017, 07:23 UTC. Available at: Accessed December 16, 2017.
APA style
"gemstone identification". (2017, December 16). In Alexandrite Tsarstone Collectors Guide. Retrieved 07:23, December 16, 2017, from
Bluebook style
"gemstone identification", (last visited December 16, 2017).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "gemstone identification", (See results 1 - 10 of about 12 for gemstone identification) (as of Dec. 16, 2017, 07:23 GMT).
CBE/CSE style
David Weinberg. "gemstone identification". In Alexandrite Tsarstone Collectors Guide. 2017 Dec 16, 07:23 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2017 Dec 16, 07:23 UTC [cited 2017 Dec 16]. Available from:
Chicago style
David Weinberg, "gemstone identification",, (accessed December 16, 2017).
MLA style
"gemstone identification". Alexandrite Tsarstone Collectors Guide. 16 Dec 2017, 07:23 UTC. 16 Dec 2017
MHRA style
David Weinberg, "gemstone identification", Alexandrite Tsarstone Collectors Guide, 16 December 2017, 07:23 UTC, [accessed 16 December 2017].
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