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1. Gem Studies Lab
2. European Gemological Laboratory
3. Hong Kong Gems Laboratory
4. Zenhokyo
5. The Russian MSU Gemological Center
6. AIGS Gemological Laboratory
7. The Gem and Jewelry Institute of Thailand
8. GemResearch Swisslab
9. Gubelin Gemological Laboratories
10. SSEF
11. AGTA Gemological Testing Center
12. American Gemological Laboratories
13. Gemological Institute of America
14. Gemmological Association of Great Britain

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