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Loose and mounted green diamonds.
Article
Exhibition Review: Green Diamonds: Natural Radiance

Review of Green Diamonds: Natural Radiance at the Natural History Museum of Los Angeles.

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Article
The Magic of Colored Diamonds

Colored diamonds are in the spotlight. They’re routinely breaking records at auction houses. Learn more about these gemological marvels of the rarest order.

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Winter 2017 Gems & Gemology
Article
Winter 2017 G&G: Cullinan-Like Superdeep Diamonds, the Artistic Exquisite Gem Carvings of the Dreher Family, and Matrix-Matched Corundum Standards

A summary of the Winter 2017 issue of Gems & Gemology.

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Real-Time Microradiography of Pearls: A Comparison Between Detectors

Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).

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Synthetic ruby overgrowth on natural sapphire seed.
Two Unusual Natural Sapphires with Synthetic Ruby Overgrowth

For the first time, the Carlsbad and New York labs see natural sapphire seeds with synthetic ruby overgrowth.

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Diamond with uneven “lizard skin” surface texture.
Lizard Skin on Deformed Diamond

The surface texture of a diamond is affected by the gemstone’s structure.

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Alexandrite cabochon in fluorescent (left) and incandescent light (right).
Cat’s-Eye Alexandrite with Unique Inclusion Pattern

Examination of a chatoyant alexandrite cabochon.

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Sub-hexagonal etch pits in synthetic moissanite.
Synthetic Moissanite Imitating Rough Diamond

A light green specimen, submitted as a rough diamond, is actually a synthetic moissanite.

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Peter J. Dunn (1942–2017)

An obituary for influential mineralogist Peter J. Dunn.

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Presenters at the World of Gems Conference.
World of Gems Conference

A report from the fifth World of Gems Conference, held September 23–24 at the Loews Hotel in Chicago.

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