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Bayer Gems
Jewelry design and consulting firm buys and sells gemstones.
http://www.bayer-gems.com/
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Diamonds
Diamonds in all sizes and qualities in brilliant and fancy cuts.
http://www.diamantgrosshandel.com
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German Gemmological Association
Training and research in modern gemmology. Programs and fees, diamond grading, and enrollment. Site in English and German.