Winter 2017 - Volume 53, Issue 4
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<em>Gota de Aceite</em> in an emerald from Zambia.
Gota de Aceite in a Zambian Emerald

A phenomenon usually seen in Colombian emeralds is found in a specimen from Zambia.

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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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Campbell Bridges’s tsavorite collection.
Celebrating 50 Years of Tsavorite

An exhibit at the 2017 AGTA Tucson Gem Fair celebrates the work of Campbell Bridges.

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Presenters, session advocates, and senior executives from GIA at GSA’s annual meeting.
GSA 2017 Annual Meeting

Experts shared the latest research on gemstones at the Geological Society of America annual meeting in Seattle.

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The 187.63 ct Foxfire rough diamond.
The Foxfire Diamond, Revisited

The 187.63 ct rough diamond from Canada’s Diavik mine shows surprising reactions to ultraviolet light.

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