AGTA
ASM Knowledge Hub
Australian Geographic
Gemmological Association of Great Britain (Gem-A)
Gemstone Database
GIA (USA)
German Gemmological Association DGemG
Gems & Jewellery (Gem-A)
Gems & Gemology (GIA)
InColor (ICA)
Journal of Gemmology (Gem-A)
National Gem & Jewellery Authority of Sri Lanka (NGJA)
Swiss Gemmological Institute (SSEF)
