Barcelona
Barcelona
http://www.ub.es/escgem/gemmo.htm
GIA
GIA
http://www.gia.edu/education/24245/section_main_page.cfm
Gemmology Belgie
Gemmology Belgie
http://www.gemmology.be/
Herentals
Herentals
http://www.provant.be/scholen/pcvoa/diamant.htm
Idar-Oberstein
Idar-Oberstein
http://www.dgemg.com/
Leiden
Leiden
http://www.naturalis.nl/asp/page.asp?alias=naturalis.nl&view=naturalis.nl&id=i000256&frameurl=http%3
Linz
Linz
http://www.ooe.wifi.at/
London
London
http://www.gem-a.info/
Madrid
Madrid
http://www.ige.org/
Milaan
Milaan
http://www.orologioweb.it/redazione/igi.asp