Gemmologia
- www.geminterest.com
- www.yourgemologist.com
- www.thaigem.com
- www.gemmologyonline.com
- www.fieldgemology.org
- www.gemologyproject.com
- www.gemstone.org
- www.themelis.com
- www.asia-gems.com
Instruments
Talla
- www.deltaonelapidary.com
- www.tradeshop.com
- www.bestcutgems.com
- www.gemstoneartist.com
- www.faceters.com
Diamants
- www.amnh.org/exhibitions/diamonds
- www.diamondwww.com
- www.diamondring.com
- www.famousdiamonds.tripod.com
Altres gemmes
- www.ruby-sapphire.com
- www.webmineral.com
- www.mindat.org
- www.mineralogie.uni-wuerzburg.de/links.html
- www.inclusionsinquartz
Gemmes sintètiques
- www.apollodiamond.com
- www.chatham.com
- www.gemesis.com
- www.lifegem.com
- www.lucentdiamonds.com
- www.newagediamonds.com
- www.ramaura.com
- www.tairus.com
