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GIA & Gemworld information

Click Gemworld International or GIA to find out more information on Gemstone Identification and U.S. Gemstone Pricing.

Robert M. Shipley established the Gemological Institute of America (GIA) in 1931. GIA is the world’s foremost authority on diamonds, colored stones, and pearls. Gemstones are identified and graded by GIA so that they can be classified according to price.

In 1982, Richard Drucker introduced the world's gemstone industry a colored gemstone pricing guide, now known as GemGuide. The publication, which is recognized as the industry leader for gem pricing and market information, is used for valuation and information in more than 40 countries by jewelers, appraisers, and as a reference in legal cases involving valuation.