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

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

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

Antwerp World Diamond Center ....................................................................................... .............................. Land: Belgien http://www.hrd.be

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

California Institute of Technology ....................................................................................... .............................. Land: USA http://www.caltech.edu/

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Canadian Gemmological Association ....................................................................................... .............................. Land: Kanada http://www.canadiangemmological.com

Centre de Recherche Gemmologique ....................................................................................... .............................. Land: Frankreich http://www.crg-dug.fr/

Centro Informazione e Servizi Gemmologici ....................................................................................... .............................. Land: Italien http://www.cisgem.it/

Cochise College ....................................................................................... .............................. Land: USA Skywalker.cochise.edu

Deutsche Gemmologische Gesellschaft ....................................................................................... .............................. Land: Deutschland http://www.dgemg.com

Gemmological Association ....................................................................................... .............................. Land: Großbritannien http://www.gem-a.info

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

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

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

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

Gübelin Gem Lab ....................................................................................... .............................. Land: Schweiz http://www.gubelinlab.com

Instituto Gemológico Español ....................................................................................... .............................. Land: Spanien http://www.ige.org

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

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

Mindat ....................................................................................... .............................. Land: Großbritannien http://mindat.org

Mineralienatlas ....................................................................................... .............................. Land: Deutschland http://www.mineralienatlas.de

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

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

The Walter Geology Library / Universität von Texas ....................................................................................... .............................. Land: USA http://www.lib.utexas.edu/geo/links.html#journ

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