Coast to Coast Rare Stones - Sister site to johnjbradshaw.com; Find all your rare and collectible gems here.

Alpine Gems - The "Canadian Gemstone" site from Brad Wilson, one of the Coast to Coast team.

GemDat-org - New site with great info and pictures of all types of gemstones.

AGTA  - American Gem Trade Organization

GIA - Gemological Institute of America

Gem-A  The Gemmological Association of Great Britain

The Guide - GemWorld International publishes pricing information available to the gem trade.

Gems & Gemology (G&G) - One of the world's best gemological publications from GIA

Smithsonian Institution - United States National Museum

Harvard University - Beautiful New England Museum housing a fabulous collection of both gems and minerals

Tower of London - Home of the British Crown Jewels