Gemological Institute Of America | All About Gemstones

Feature Article

The Enigmatic Gemstone: Opal’s Playful Dance with Light

: Courtesy: Thomas Cenki

Gems & Gemology

A Pearl Identification Challenge

November Birthstone

Topaz: The Gem That Launched a Thousand Legends

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: Courtesy of W. Contantin Wild & Co.

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Research & News

New Service

The GIA Diamond Origin Report: Traceability Based on Science

Consumers now, more than ever, have a heightened awareness of sustainably and ethically sourced products. The GIA Diamond Origin Report uses scientific evaluation to provide confirmation of a diamond’s geographic origin.
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Promotions

Latest Laboratory Promotions

View details about the latest diamond grading promotions.
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A diamond necklace that features a 100.02 Fancy Intense yellow diamond. The pendant is done in the shape of a musical instrument.

Industry Analysis

Holiday Sales Predictions, Sotheby’s Sales

U.S. holiday sales predictions are better than expected. Sotheby’s Hong Kong auction features a 100 ct yellow diamond necklace by GIA alumna Anna Hu.
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Emerald inclusion inside a large emerald specimen.

Micro-World

Intergrown Emerald Specimen from Chivor

An emerald specimen from Chivor hosts a large, well-formed emerald inclusion.
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Freshwater pearls from the Mississippi River system with three mussel shells.

Gem News International

Natural Pearls from the Mississippi River Tributaries

GIA had the unique opportunity to study the gemological and chemical characteristics of 854 natural freshwater pearls from the Mississippi River system.
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