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

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