Jewelrywhole.com contains a lot of listings about jewelry supplies, earrings, bracelets, gemstones, charms, watches, fine art, unique designs, personalized jewelry, guides & directories.
Bayer Gems
Jewelry design and consulting firm buys and sells gemstones.
http://www.bayer-gems.com/
Diamonds
Diamonds in all sizes and qualities in brilliant and fancy cuts.
http://www.diamantgrosshandel.com
German Gemmological Association
Training and research in modern gemmology. Programs and fees, diamond grading, and enrollment. Site in English and German.
http://www.dgemg.com/
