Fall 2014 - Volume 50, Issue 3
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Non-nacreous Pen Pearls
Observations on Pearls Reportedly from the Pinnidae Family (Pen Pearls)

Examines the internal structure, chemical composition, and spectroscopic features of 22 pen pearls.

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Heavenly Bodies: Cult Treasures and Spectacular Saints from the Catacombs
Books: Heavenly Bodies: Cult Treasures and Spectacular Saints from the Catacombs

Review of Paul Koudounaris’s Heavenly Bodies: Cult Treasures and Spectacular Saints from the Catacombs.

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Colorless CVD-Grown Synthetic Diamond
Diamond Laser

Overview and commentary on the 2014 Optics & Photonics News article “Diamond Raman Lasers.”

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Colombian Emeralds
Colombian Emerald Mining: Will the Giant Awaken?

Overview and commentary on the 2013 The Journal of Gemmology article “Peñas Blancas: An Historic Colombian Emerald Mine."

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“Red” Chrysoberyl versus Alexandrite: The Impact of Elevated Chromium Levels on Color and Color-Change Properties

Overview and commentary on the 2014 Journal of Gemmology article “Purple to Reddish Purple Chrysoberyl from Brazil.”

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0.34 ct CVD synthetic
CVD Synthetic Diamond with Unusual Inclusions

Examination of a CVD synthetic diamond with an unusual pattern of growth dislocations that resemble natural inclusions.

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Natural Mixed Cape Diamond
Mixed-Type Cape Diamond

A Fancy orangy yellow “cape” diamond featured an unexpected 480 nm band, a defect normally associated with orange color.

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Non-nacreous Pearls
Natural Pearls Reportedly from a Spondylus Species (“Thorny” Oyster)

A rare look at natural pearls from a known Spondylus species, commonly called “thorny” oysters.

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1.50 ct Fancy Dark gray CVD synthetic diamond
Two Fancy Dark Gray CVD Synthetic Diamonds

Examination of two CVD synthetic diamonds with an unusual Fancy Dark gray color.

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73.69-mm-long Synthetic Ruby Crystal
Flame-Fusion Synthetic Ruby Boule with Flux Synthetic Ruby Overgrowth

This synthetic ruby specimen features two growth methods within the same crystal.

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