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

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