Accredited Gemologists Association Country: USA http://accreditedgemologists.org

American Gem Society Country: USA http://www.americangemsociety.org

American Gem Trade Association Country: USA http://www.agta.org

Antwerp World Diamond Center Country: Belgium http://www.hrd.be

Asian Institute of Gemological Sciences Country: Thailand http://www.aigsthailand.com

California Institute of Technology - Division of Geological and Planetary Sciences - Country: USA http://www.caltech.edu/

Canadian Gemmological Association Country: Canada http://www.canadiangemmological.com

Centre de Recherche Gemmologique Country: France http://www.crg-dug.fr/

Centro Informazione e Servizi Gemmologici Country: Italy http://www.cisgem.it/

Cochise College - Virtual Geology Museum (VGM) "Hall of Gemstones" - Country: USA Skywalker.cochise.edu

Deutsche Gemmologische Gesellschaft Country: Germany http://www.dgemg.com

Gemmological Association Country: Great Britain http://www.gem-a.info

Gemmological Association of All Japan Country: Japan http://www.gaaj-zenhokyo.co.jp

Gemological Institute of America Country: USA http://www.gia.edu/

Gübelin Gem Lab Country: Switzerland http://www.gubelinlab.com

Instituto Gemológico Español Country: Spain http://www.ige.org

International Colored Gemstone Association Country: USA http://www.gemstone.org

International Gem Society Country: USA http://www.gemsociety.org

Mindat Country: Great Britain http://mindat.org

Mineralienatlas Country: Germany http://www.mineralienatlas.de

Queensborough Community College - Department of Biological Sciences & Geology - Country: USA http://www.qcc.cuny.edu/BiologicalSciences/rscal/

The Gemmological Association of Australia Country: Australia http://www.gem.org.au

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