Summer 2013 - Volume 49, Issue 2
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Very Large Rough Diamond

A report on a 1,138 ct rough diamond, possibly the largest ever examined by GIA.

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Rare Faceted Neptunite

Raman spectroscopy reveals orangy red neptunite—the first examined by GIA—in identification of a 11.78 ct faceted “black” octagonal modified step-cut stone.

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Unusual Curved Color Zoning In Emerald

A report on a 1.17 ct emerald obtained in Kabul, Afghanistan for GIA's permanent reference collection

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Fish-Like Inclusion Found in Fancy Yellow "Cape" Diamond

A recent lab examination at GIA New York revealed an inclusion in a rectangular Fancy Yellow called "pareidolia," which means it was a resemblance of the scales and form of a fish.

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Calcium Fluoride Coating Found on 13 "Fancy" Pink Diamonds

Recent lab examination reveals that traditional treatments such as calcium fluoride coating are still prevalent in the trade, and great care must be taken to identify them.

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Atypical Freshwater Cultured Pearls with Damaged Nacre

The New York lab received four baroque-shaped pearls with damaged nacre layers

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Strong Color Zoning in Diamond Reflects Complex Growth Environment

A report on a 2.08 ct emerald-cut diamond graded as Fancy Dark orangy brown.

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A Large Irradiated Green-Yellow Diamond

GIA's identification of a large diamond as artificially irradiated based on careful spectroscopic analysis and lab database review.

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