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Alexandrite

Tsarstone collectors guide

• Chapters
  • Chapter 1. Insidious siberian
  • Chapter 2. Diaphanite or Alexandrite?
  • Chapter 3. Species and variety
  • Chapter 4. Classification and properties
  • Chapter 5. The Alexandrite effect
  • Chapter 6. World occurrences
  • Chapter 7. Synthetics and imitations
  • Chapter 8. Myths, legends and lore
  • Chapter 9. Alexandrite buyer's guide
  • Chronological History of Alexandrite
  • FAQ
  • Glossary of Terms
  • Bibliography
• Directory
  • Appraisals (6)
  • Gemstone dealers (6)
  • Jewelers (5)
  • Laboratories (14)
  • Manufacturers (2)
  • Museums (2)
  • Organizations (2)
  • Publications (3)
• Discussion
  • Tsarstone Museum
  • Treasure Hunters
  • Alexandrite Effect
  • Alexandrite Encyclopedia
  • Website feedback
  • Project news
• Gemstones
  • Alexandrite (69)
  • Chrysoberyl (19)
  • Chrysoberyl Cats Eye (10)
• Localities
  • Dowerin (Australia)
  • Carnaiba Mine (Brazil)
  • Caraiba mine (Brazil)
  • Serra Dourada (Brazil)
  • Esmeraldas de Ferros (Brazil)
  • Novo Cruzeiro (Brazil)
  • Hematita (Brazil)
  • Itaitinga Mine (Brazil)
  • Teofilo Otoni (Brazil)
  • Deobhog (India)
  • Ilakaka (Madagascar)
  • Mogok (Myanmar)
  • Izumrudnye Kopi (Russia)
  • Malyshevskoye (Russia)
  • Balangoda (Sri Lanka)
  • Horana (Sri Lanka)
  • Tunduru (Tanzania)
  • Lake Manyara (Tanzania)
  • La Madera Mt. (USA)
  • Girdlestone Farm (Zimbabwe)

diamond certification

1. 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.

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2. 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

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3. 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

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4. 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

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5. 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

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6. 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

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7. GemResearch Swisslab

Private gemological research company focused on the characterization of high-quality gems from newly opened mines.

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8. 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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9. 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

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10. The Russian MSU Gemological Center

Found at 1995, MSU Gemological Center is a part of MSU Department of Geology and co-founders of the Russian Gemological Society (2000), the Union of Modern and Antique Jewelry Appraisers, and member of the Russian Diamond Chamber.

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11. 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

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12. 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

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13. European Gemological Laboratory

As a member of the EGL USA Group, European Gemological Laboratory (EGL) is a full-service lab and offers a comprehensive array of gem identification, evaluation reports including customized reports of identification for rough and polished diamonds as well

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14. Gem Studies Lab

GAA was formed in Sydney, on the 29th October 1945, the Association has been responsible for producing Australia’s gemmologists by educating and updating members of the gem and jewellery industry and the general public, about all aspects of gemstones an

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