Winter 2017 - Volume 53, Issue 4
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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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Polished vein of azurite with malachite and chrysocolla from Cochapata.
New Azurite-Malachite Mixture from Peru

A Peruvian source yields a new azurite-malachite mixture.

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