Institut dan laboratorium
- American Gem Society - AGS
- Canadian Gemmological Association - CGA
- Canadian Institute of Gemmology - Cigem
- European Gemological Laboratory (USA) - EGL USA
- Gemmological Association of Great Britain - Gem-A
- Gemological Institute of America - GIA
- Gemmology Institute of Southern Africa - GISA
- Gemological Science International
- International Gemological Institute - IGI
- Swiss Gemmological Institute - SSEF
- International School of Gemology - ISG
- gci gemological centers- GCI
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