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Science, tools, identification, treatment, valuation & grading of gems.
Jewelry and Lapidary
Cutting and faceting stones, jewelry settings, metals, tools and techniques.
Gemstone Encyclopedia
Detailed information for any gemstone you are interested in.
Gem Price Guide
The IGS Gem Price Guide covers many popular as well as unusual, collectible gems. Find your gem’s retail value based on its type, size, and qualities.