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

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