Fall 2015 - Volume 51, Issue 3
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Three colorless synthetic diamonds weighing 2.02, 2.20, and 2.30 ct
Large Colorless HPHT-Grown Synthetic Gem Diamonds from New Diamond Technology, Russia

Examines a new source of colorless and near-colorless gem-quality HPHT synthetic diamonds using spectroscopic and gemological analysis.

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299.35 ct and 112.61 ct diamond rough
Letšeng’s Unique Diamond Proposition

Explores the history, geology, and current production of this unique source of large diamonds.

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Rough diamond with green coloration along internal cleavage.
Rough Diamond Fragment with a Large Green Cleavage Surface

A colorless diamond crystal fragment shows an eye-visible bluish green internal induced radiation stain that developed in a near-surface environment.

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Emerald cabochon with six-rayed star.
Large Star Emerald

An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.

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Petrified wood carvings and cabochons.
Thai-Myanmar Petrified Woods

The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.

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Quartz cabochons with cross-shaped quartz inclusions.
Rare “Star and Cross” Quartz from Brazil

Two quartz specimens showing asterism and cross-shaped inclusions are analyzed.

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Painted glass slides create filter.
Modified Rheinberg Illumination

A lighting method modified for gemological microscopy provides false-color contrast to enhance inclusion scenes.

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Mineral Treasures of the Ozarks Book Cover
Books: Mineral Treasures of the Ozarks

Review of Mineral Treasures of the Ozarks, by Bruce L. Stinchcomb.

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Michele della Valle Book Cover
Books: Michele della Valle: Jewels and Myths

Review of Michele della Valle: Jewels and Myths, by Michele della Valle.

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Maker & Muse Book Cover
Books: Maker & Muse: Women and Early Twentieth Century Art Jewelry

Review of Maker & Muse, Women of the 20th Century Art Jewelry, by Elyse Zorn Karlin.

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