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

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