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