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

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