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.
One of the industry's leading online gemology forums.
Non-profit gemstone and gem science wiki-style database.
Online mineralogy forum and database.
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.