Winter 2015 - Volume 51, Issue 4
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The 135.74 ct Grand Sapphire
The Grand Sapphire of Louis XIV and The Ruspoli Sapphire: Historical and Gemological Discoveries

Archival research and gemological characterization reveal the true story of this 135.74 ct blue sapphire from the French crown jewels.

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Tiara from Colombia or Ecuador ca. 1690
Exhibition Review: Glitterati: Portraits and Jewelry from Colonial Latin America

Review of Glitterati: Portraits and Jewelry from Colonial Latin America at the Denver Museum of Art.

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Vanadium and Chromium-Bearing Pink Pyrope Garnet: Characterization and Quantitative Colorimetric Analysis

This type of pink pyrope garnet, believed to have been mined in Tanzania, shows a distinct color-change phenomenon resulting from its unique chemical composition.

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Book Review: Towards an Art History of Medieval Rings: A Private Collection

Review of Towards an Art History of Medieval Rings: A Private Collection, by Sandra Hindman, with Ilaria Fatone and Angelique Laurent-di Mantova.

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13.09 ct Fancy yellow rough diamond
Very Large Type Ib Natural Diamond

A 13.09 ct. Fancy yellow rough diamond, with C centers causing the intense color, is seen in the New York lab.

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Rough rubies from Zahamena National Park in Madagascar.
Rubies from a New Deposit in Zahamena National Park, Madagascar

A field expedition from GIA Bangkok explores a new ruby deposit and collects specimens for study.

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Collector’s Guide to Herkimer Diamonds Book Cover
Book Review: Collector’s Guide to Herkimer Diamonds

Review of Collector’s Guide to Herkimer Diamonds, by Michael R. Walter.

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Letters: Trapiche Nomenclature

A response to the Fall 2015 G&G article on trapiche emerald from Colombia.

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2.51 and 3.23 ct CVD synthetic diamonds
Two Large CVD-Grown Synthetic Diamonds Tested by GIA

Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.

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GSA 2015 Annual Meeting

A report summarizing the annual meeting of the Geological Society of America in Baltimore.

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