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Tsarstone collectors guide


List of well-known gemological laboratories equipped to test chrysoberyl gemstone varieties, including identification of natural alexandrite gemstones.

Resource listing

Gem Studies Lab
Gem Studies Lab The Gemmological Association of Australia (GAA) is Australia’s historic trade-accepted non-profit educational authority for gemology.
European Gemological Laboratory
Provides identification for rough and polished diamonds, colourless and coloured diamonds, as well as coloured gems and pearls.
Hong Kong Gems Laboratory
Provides identification and appraisal reports for rough and polished jade, colour gemstones and pearls.
One of the most authoritative gemmological laboratory offering gemmological analysis using the latest equipment.
The Russian MSU Gemological Center
Issues four types of identification reports in two formats, including Diamond Report, Gemstone Testing Report, Jewelry Report and Rough Diamond Report.
AIGS Gemological Laboratory
Well known laboratory for its expertise in coloured gemstones, especially ruby, sapphire, emerald, jade and rare stones. Also provides identification and grading services for diamonds and jewellery.
The Gem and Jewelry Institute of Thailand
Offers authenticity of gemstones and their treatment reports, identification of pearls and their treatments, diamond grading and laser inscription on diamonds and colour gemstones.
GemResearch Swisslab
Determination of the authenticity and country of origin of rubies, sapphires and other rare colour gemstones. Also offers gemstone reports and inscriptions.
Gubelin Gemological Laboratories
An independent member of the Gubelin Holding and one of the world's most respected laboratories, offers gemstones, diamond and pearl reporting.
An independent, international, non-profit organization dedicated to the identification, treatment and origin of gemstones.
AGTA Gemological Testing Center
Provides identification and origin reports and other colour gemstone services, including testing for beryllium in sapphire, natural origin of colour in diamonds and country of origin for sapphires, rubies and alexandrites.
American Gemological Laboratories
Provides independent coloured gemstone identification reports on all coloured gemstones including emeralds, rubies, sapphires and alexandrites.
Gemological Institute of America
Provides grading and identification of diamonds, coloured stones or pearls for the industry and consumers.
Gemmological Association of Great Britain
Services include reports for diamond grading, pearl and gem identification. Also provide re-polishing diagrams for diamonds and verbal assessments for diamond colour and clarity
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