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Major colors of HPHT synthetic diamonds
Observations on HPHT-Grown Synthetic Diamonds: A Review

Summarizes statistical data and distinctive features of several thousand gem-quality HPHT synthetic diamonds examined by GIA from 2007 through 2016.

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A blue synthetic star sapphire from past production of Wiede’s Carbidwerk
Synthetic Star Sapphires and Rubies Produced by Wiede’s Carbidwerk, Freyung, Germany

Details the process used by Wiede’s Carbidwerk to produce star synthetic corundum from the mid-1950s through the 1970s.

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A round, bright red gem displayed on a dark gray background.
Article
The Red Hot Gems of Summer

These red, pink and orange hued gems evoke passion and excitement – and are surefire accessories for sultry summer days.

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Article
Buried Treasure: GIA Team Documents Cheapside Hoard

GIA photographer Robert Weldon and videographer Kevin Schumacher traveled to the Museum of London to learn about the Cheapside Hoard, an extraordinary treasure that had been buried under a London tenement house for centuries.

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The Museum of London’s Extraordinary Cheapside Hoard

The history and mysteries behind a treasure of jewels hidden during the 1600s, a window to the past being fully opened to the public for the first time since a chance discovery a century ago.

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Jadeite boulder from Itoigawa, Japan
Japanese Jadeite Tables

Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.

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Brazilian Diamonds: A Historical and Recent Perspective

Recounts the history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production.

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Jadeite boulder from Itoigawa, Japan
Japanese Jadeite: History, Characteristics, and Comparison with Other Sources

Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.

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Article
The British Royal Jewels: Beautiful and Historic Gems

The British Royal Jewels are beautiful and historic gems that the heir to the throne will inherit.

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Jaipur, India: The Global Gem and Jewelry Power of the Pink City

Examines Jaipur’s role as a colored stone cutting and jewelry manufacturing center, with profiles of 17 companies and their factory, trading, and retail operations.

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