Winter 2017 - Volume 53, Issue 4
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Rough CLIPPIR diamonds
The Very Deep Origin of the World’s Biggest Diamonds

Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular, and Resorbed), that formed in a superdeep environment.

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<em>Gota de Aceite</em> in an emerald from Zambia.
Gota de Aceite in a Zambian Emerald

A phenomenon usually seen in Colombian emeralds is found in a specimen from Zambia.

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Gerd Dreher agate lily and Patrick Dreher citrine mouse
Gem Virtuosos: The Drehers and Their Extraordinary Carvings

A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.

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Bracelet containing akoya cultured pearls from Australia
Akoya Cultured Pearl Farming in Eastern Australia

Characterizes the akoya cultured pearls produced on the eastern shoreline of Australia using native Pinctada imbricata fucata mollusks.

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Shattuckite typically forms aggregates of circular to spherulitic masses composed of acicular crystals
Quarterly Crystal: Shattuckite in Quartz

A quartz crystal from Namibia, hosting of spherulitic to circular masses of shattuckite, is examined.

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Micro-Features of Ruby
Inclusions in Natural, Synthetic, and Treated Ruby

Provides a visual guide to the internal features of natural, synthetic, and treated rubies.

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Three cultured pearls, one natural
Real-Time Microradiography of Pearls: A Comparison Between Detectors

Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).

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Accurate Reporting of Key Trace Elements in Ruby and Sapphire Using Matrix-Matched Standards

Presents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.

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Faceted manufactured glass beads.
Wollastonite Blizzard Within Glass

Beads believed to be synthetic quartz are discovered to be glass with a surprising set of inclusions.

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Yellowish green vesuvianite crystal in faceted Burmese ruby.
Vesuvianite in Burmese Ruby

A yellowish green crystal inclusion in a ruby is found to be vesuvianite.

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