Links
Mary van der Aa
Eclectic style, handmade jewelry. View the new Architect and Architect Sans collections featuring many custom-cut, and one-of-a-kind stones by Todd Wacks.
Gemological Institute of America
The world's foremost authority in gems and gemology.
Gemology Online
One of the industry's leading online gemology forums.
Gemology Project
Non-profit gemstone and gem science wiki-style database.
Mindat
Online mineralogy forum and database.
Gem-A
Thegemmological association of Great Britain.
American Gem Trade Association
The latest and greatest in spectacular, rare gemstones.
United States Faceters Guild
Tons of info for aspiring crystal machinists.