The American Gem Society. Protecting the jewelry consumer for over 65 years. AGS Offers certifications, education, Gemstone Grading, and offers membership to retail jewelers who adhere to the highest ethical and moral standard. Shop with a jeweler you can trust! Visit your local AGS member jeweler. ...

ICA - International Colored Gemstone Association ...

Dedicated to bringing quality information and educational services to everyone interested in gemstones.

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