Winter 2017 - Volume 53, Issue 4
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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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This 20.60 ct specimen was purchased by the client as a “natural white pearl.”
Filled Pearl with Surface Features

A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.

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DiamondView images show the fluorescence in two unusual diamonds.
Two Natural Type IIa Diamonds with Strong Phosphorescence and Ni-Related Defects

Natural diamonds exhibit characteristics normally seen in synthetic material.

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Sixteen samples of facet-quality ruby
Preliminary Observations on Facet-Grade Ruby from Longido, Tanzania

Microscopic observation and trace element analysis is performed on rubies from Longido.

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Top: The drilled green briolettes. Bottom: Fluid inclusions, crystals, and two-phase inclusions.
Coated Beryl Imitating Emerald

Coating on a beryl demonstrates the importance of thorough examination of jewelry and gem materials.

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Opaque round brilliant black diamond.
Interesting Growth Structure in Black Diamond

Observations on a black diamond with an unusual inclusion pattern lead to theories on growth.

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