Winter 2014 - Volume 50, Issue 4
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Books: Untamed Encounters: Contemporary Jewelry from Extraordinary Gemstones

Review of Mimi Lipton's Untamed Encounters: Contemporary Jewelry from Extraordinary Gemstones.

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Margaritologia
Pearl Newsletter: Margaritologia

Margaritologia, a quarterly newsletter on pearls, was recently launched by Elisabeth Strack.

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Rough Diamond Auctions: Sweeping Changes In Pricing and Distribution

Examines the growing percentage of rough diamonds being sold through auctions, a shift that has caused price volatility while opening up supply to more manufacturers and dealers.

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8.41 ct pear-shaped Fancy Vivid purple-pink diamond
Record Prices at Gem Auctions

Auction price records were broken in late 2014 as ultra-wealthy buyers vied for rare, important gemstones.

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Dyed green marble imitating jadeite
Dyed Green Marble Imitating Jadeite

What appeared to be high-quality jadeite was actually dyed green marble with calcite as the main mineral.

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Type IaB natural diamond
Natural Colorless Type IaB Diamond with Silicon-Vacancy Defect Center

Examination revealed a rare instance of a silicon-vacancy defect in natural diamond.

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Study sample emeralds
A Preliminary Study on the Separation of Natural and Synthetic Emeralds Using Vibrational Spectroscopy

Reports preliminary findings—based on FTIR and Raman spectrometry of more than 300 samples—on distinguishing natural and synthetic emeralds using vibrational spectroscopy.

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Spinel’s visible spectrum
New Deposit of Black Opal from Ethiopia

The Stayish mine in Ethiopia’s Wollo province has been producing black opal since 2013.

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Dark pink-purple spinel
Spinel Inclusion in Spinel

Examination of a pink-purple spinel revealed what appeared to be a spinel crystal inclusion.

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Blue Moon, rough and cut
Study of the Blue Moon Diamond

Presents spectroscopic and phosphorescence data of the Blue Moon, a 12.03 ct Fancy Vivid blue diamond discovered at the historic Cullinan mine in early 2014.

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