- International Gemological Institute (IGI)
- Gemological Institute of America (GIA)
- American Gemological Society (AGS)
- American Gem Trade Laboratory
- American Gemological Laboratories (AGL)
- European Gemological Laboratory (EGL)
- Gemological Association of All Japan (GAAJ)
- Gemmological Institute of Thailand (GIT)
- Asian Institute of Gemmological Sciences (AIGS)
- Swiss Gemmological Institute
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