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http://www.ags.org/
offers programs in gemology.
http://www.aigsthailand.com/
http://www.gagtl.ac.uk/
GIA's mission is to ensure the public trust by educating and serving the gem and jewelry industry worldwide.
http://www.gia.org/
information resource with shopping tips, the latest market news, and Gem-o-Rama.
http://www.gemstone.org/
dedicated to bringing quality information and educational services to everyone interested in gemstones.
http://www.gemsociety.org/
http://www.igiworldwide.com/