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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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Diamond Fun Facts

Learn more about one of the Earth’s most fascinating creations, including some that became the most famous.

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Article
The Smithsonian Gem and Mineral Collection

A behind-the-scenes exploration of the Smithsonian's Janet Annenberg Hooker Hall of Geology, Gems, and Minerals.

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Fancy-colored Diamond
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Fancy Color Diamond History and Lore

While fancy color diamonds have traditionally been a small part of the diamond business, their popularity and availability have grown in the past several decades.

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The Wittelsbach Blue

This article describes what is known about the Wittelsbach Blue since it was first reported in 1666, and the gemological information released to date on this diamond.

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Computer Rendering of the “French Blue” Diamond
The French Blue and the Hope: New Data from the Discovery of a Historical Lead Cast

With the use of modern tools and technology, this article sheds light on the history and provenance of both the French Blue and the Hope diamonds.

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Article
Jewelry that Speaks the Language of Flowers

A flower is one of nature’s most delicate delights, so it’s natural that jewelry designers have long found inspiration in them, seeking to capture their fleeting beauty in jewelry.

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Coated Pink Diamond — A Cautionary Tale

The Diamond Trading Company (DTC) Research Centre had the opportunity to examine a diamond that, on submission to a commercial gem laboratory.

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An Investigation into the Cause of Color in Natural Black Diamonds from Siberia

Black and dark gray diamonds from Siberia, Russia, were studied by analytical scanning and transmission electron microscopy.

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Two Treated-Color Synthetic Red Diamonds Seen in the Trade

Two dark brownish red faceted stones, recently submitted to the GIA Gem Trade Laboratory for standard origin-of-color reports, were found to be treated synthetic diamonds.

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