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Flora and fauna brooches by Paula Crevoshay
Preview of Nature Art Science with Paula Crevoshay

Renowned designer Paula Crevoshay discusses artistic influences and her latest creations.

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Indonesian opal cabochons, 6.94 and 3.79 ct.
Opal from West Java, Indonesia

Description of Indonesian opal reportedly from West Java.

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A round, bright red gem displayed on a dark gray background.
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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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Chrysoprase and Prase Opal from Haneti, Central Tanzania
Chrysoprase and Prase Opal from Haneti, Central Tanzania

Commercial quantities of gem-quality chrysoprase and green prase opal (nickel-bearing chalcedony and common opal, respectively) have been recovered from altered serpentinite deposits near Haneti, Tanzania.

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Green Opal From East Africa

Gemological and chemical analysis of bright green gem-quality opal from Tanzania.

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Opal from Queretaro, Mexico: Occurrence and Inclusions

An examination of play-of-color opal from Mexico and its variety of inclusions.

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Milky white opals
UV-Reactive Opal

The first documented UV-reactive chemical treatment to make opal appear tenebrescent.

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Water Immersion Reveals Dye in Fire Opal

A simple test easily detected dye treatment in fire opal.

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