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Asian Institute of Gemology Sciences

offers programs in gemology.

http://www.aigsthailand.com/

Gemological Institute of America

GIA's mission is to ensure the public trust by educating and serving the gem and jewelry industry worldwide.

http://www.gia.org/

Gems, ruby, sapphire, etc

Wholesale sales of fine gems, including ruby, sapphire, tourmaline, spinel,tanzanite, alexandrite.

http://www.palagems.com/

International Colored Gemstone Association

information resource with shopping tips, the latest market news, and Gem-o-Rama.

http://www.gemstone.org/

International Gem Society

dedicated to bringing quality information and educational services to everyone interested in gemstones.

http://www.gemsociety.org/

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