Fall 2017 - Volume 53, Issue 3
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Natural surface growth marks on Brazilian beryl.
Awards for James Shigley and Jonathan Muyal

Two regular G&G contributors receive awards for their work in the field of gemology.

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The rough sapphire crystal as it was mined.
The “Montana Queen” Sapphire

A rough blue sapphire crystal from the Rock Creek deposit is heat treated and cut to become the largest known faceted blue Montana sapphire.

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Color-change garnets under different light sources.
Blue-Green Pyrope-Spessartine Garnet with High Vanadium

Garnets with a unique color and a previously unreported chemical composition are examined at GIA’s Carlsbad lab.

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A garimpeiro working  Mustang Resources’ concession.
Update on Mozambique Ruby Mining and Trading

Current activity and production at various sites around Mozambique are reported.

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Amazonite bracelet.
Impregnated Amazonite

High-quality amazonite currently available in the jewelry market is tested at GIA’s Carlsbad laboratory.

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75th Swiss Gemmological Society Conference and European Gemmological Symposium

A report from the 75th Swiss Gemmological Society Conference and European Gemmological Symposium, held in Zermatt, Switzerland June 30–July 1, 2017.

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Sapphires from Antang and Gombe, Nigeria.
Yellow, Green, and Blue Sapphires Reportedly from Antang and Gombe, Nigeria

Nineteen sapphires of various colors, reportedly from sources in northern Nigeria, are studied in GIA’s Tokyo laboratory.

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Green synthetic sapphire with clouds of bubbles.
Unusual Inclusions in Green Synthetic Sapphire

A green step-cut synthetic specimen hosts inclusions that provide insight into its growth method.

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A pair of pearl and diamond earrings set with one CVD synthetic melee.
A Melee-Sized CVD Synthetic Diamond in Pearl and Diamond Jewelry

A CVD-grown melee is found in a pearl and diamond earring.

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Cabochons of strongly zoned Brazilian quartz.
Multi-Color-Zoned Quartz from Brazil

A Brazilian quartz with unusual color zoning caused by variable iron content is examined.

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