Spring 2017 - Volume 53, Issue 1
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Negative crystals creating rosette pattern.
Negative Crystals in Sapphires

Sapphires from Baw Mar host multiphase inclusions in appealing patterns.

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Bolivian ametrine crystal.
Ametrine Optical Dishes: Windows into the Effects of Crystal Structure

Optical activity is studied using a polished block of ametrine.

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Chatoyant band in imitation pearl.
Imitation Cat’s-Eye Pen “Pearls”

Imitation pearls show kaleidoscopic colors with illumination.

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Bastnäsite from Pakistan
Astrophyllite in Bastnäsite-(Ce)

A bastnäsite with eye-visible inclusions of astrophyllite is examined in GIA’s Carlsbad lab.

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Topaz with mystery inclusion.
Quarterly Crystal: Mystery in Topaz

A topaz hosting a group of inclusions is examined in the Carlsbad lab.

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Ethiopian precious opal showing chatoyancy.
Flashes and Flames in Ethiopian Opal

Chatoyancy, rarely seen in play-of-color opal, is observed in Ethiopian material.

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