สถาบัน
- American Gem Trade Association (AGTA) - http://www.agta.org
- CISGEM (Italy) - http://www.cisgem.it
- Carnet des Gemmologues, Gemmologistes Francophones - http://www.geminterest.com
- CIBJO (The World Jewellery Confederation) - http://www.cibjo.org
- Gemmological Association of All Japan - http://www.gaaj-zenhokyo.co.jp
- Gemmological Institute of America (GIA) - http://www.gia.edu
- Gemopolis (Diamonds, Gems and Jewelry Center) - http://www.gemopolis.com
- International Colored Gemstone Association - http://www.gemstone.org
- KIAsia - http://www.kiasia.org
- Laboratory Manual Harmonisation Committee (LMHC) - http://www.lmhc-gemology.org/
- Ruby-sapphire.com - http://www.ruby-sapphire.com
- SSEF (Switzerland) - http://www.ssef.ch
- The Canadian Institute of Gemmology - http://www.cigem.ca
- The Diamond High Council (HRD) - http://www.diamonds.be
- The Gübelin Laboratory - http://www.gubelingemlab.ch