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 ....................................................................................... .............................. Country: USA http://www.caltech.edu/

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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 ....................................................................................... .............................. Country: USA Skywalker.cochise.edu

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

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

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

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

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

GO 340 Gemstones & Gemology / Emporia State University ....................................................................................... .............................. Country: USA http://www.emporia.edu/earthsci/amber/go340/

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

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

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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

The Mineralogy Society of Hong Kong ....................................................................................... .............................. Country: China / Hong Kong http://minsochk.org/

Queensborough Community College ....................................................................................... .............................. Country: USA http://www.qcc.cuny.edu/BiologicalSciences/rscal/

The Walter Geology Library / University of Texas ....................................................................................... .............................. Country: USA http://www.lib.utexas.edu/geo/links.html#journ

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