gemstone identification

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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; /directory/laboratories/gubelin-gemological-laboratories-wdd-003-00017.html
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; /directory/laboratories/american-gemological-laboratories-wdd-003-00020.html
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; /directory/laboratories/agta-gemological-testing-center-wdd-003-00019.html
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; /directory/laboratories/gemmological-association-of-great-britain-wdd-003-00022.html
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; /directory/laboratories/aigs-gemological-laboratory-wdd-003-00014.html
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; /directory/laboratories/zenhokyo-wdd-003-00012.html
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; /directory/laboratories/gemological-institute-of-america-wdd-003-00021.html
8. SSEF: 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; HTML, 65 Kb, 2009-03-15 03:08:12; /directory/laboratories/ssef-wdd-003-00018.html
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.; HTML, 65 Kb, 2009-03-15 02:46:44; /directory/laboratories/the-gem-and-jewelry-institute-of-thailand-wdd-003-00015.html
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; /directory/laboratories/hong-kong-gems-laboratory-wdd-003-00011.html

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Bibliographic details
Page title	gemstone identification
Author	David Weinberg
Website title	Alexandrite Tsarstone Collectors Guide
Date published	31 May 2026 12:22 UTC
Date accessed	31 May 2026 12:22 UTC
Permanent link	http://w.alexandrite.com/viewpage.html?id=ALXS-005-00001-941-10-0

AMA style: David Weinberg. "gemstone identification". In Alexandrite Tsarstone Collectors Guide. May 31, 2026, 12:22 UTC. Available at: http://w.alexandrite.com/viewpage.html?id=ALXS-005-00001-941-10-0. Accessed May 31, 2026.
APA style: "gemstone identification". (2026, May 31). In Alexandrite Tsarstone Collectors Guide. Retrieved 12:22, May 31, 2026, from http://w.alexandrite.com/viewpage.html?id=ALXS-005-00001-941-10-0.
Bluebook style: "gemstone identification", http://w.alexandrite.com/viewpage.html?id=ALXS-005-00001-941-10-0 (last visited May 31, 2026).
Bluebook: Harvard JOLT style: See Alexandrite Tsarstone Collectors Guide, "gemstone identification", http://w.alexandrite.com/viewpage.html?id=ALXS-005-00001-941-10-0 (See results 1 - 10 of about 12 for gemstone identification) (as of May. 31, 2026, 12:22 GMT).
CBE/CSE style: David Weinberg. "gemstone identification". In Alexandrite Tsarstone Collectors Guide. 2026 May 31, 12:22 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2026 May 31, 12:22 UTC [cited 2026 May 31]. Available from: http://w.alexandrite.com/viewpage.html?id=ALXS-005-00001-941-10-0.
Chicago style: David Weinberg, "gemstone identification", http://w.alexandrite.com/viewpage.html?id=ALXS-005-00001-941-10-0, (accessed May 31, 2026).
MLA style: "gemstone identification". Alexandrite Tsarstone Collectors Guide. 31 May 2026, 12:22 UTC. 31 May 2026 http://w.alexandrite.com/viewpage.html?id=ALXS-005-00001-941-10-0
MHRA style: David Weinberg, "gemstone identification", Alexandrite Tsarstone Collectors Guide, 31 May 2026, 12:22 UTC, http://w.alexandrite.com/viewpage.html?id=ALXS-005-00001-941-10-0 [accessed 31 May 2026].

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gemstone identification