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Science, tools, identification, treatment, valuation & grading of gems.
Diamond Advice
Before you buy a diamond, check out our informative guides built from our 25 years of gem expertise.
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.