Summer 2016 - Volume 52, Issue 2
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Largest blue HPHT synthetics
Large Blue and Colorless HPHT Synthetic Diamonds

Five large HPHT synthetic diamonds, examined at GIA’s Hong Kong lab, indicate the advances HPHT growth technology has made in quality and size.

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187.66 “cape” diamond from the Diavik mine
Examination of the Largest Canadian Diamond

GIA examines a 187.66 ct pale yellow diamond from Diavik, the largest rough diamond ever found in Canada.

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Fancy black pear-shaped diamond.
Separation of Black Diamond from NPD Synthetic Diamond

DiamondView is used to identify a Fancy black natural diamond from its NPD synthetic counterparts.

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Emerald with two drill holes
Unique Drilled Emerald

An emerald with drill holes containing a resinous material is seen in the New York lab.

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Yellowish green spinel.
Unusual Yellowish Green Spinel

A spinel in a rarely seen color is submitted to the New York lab.

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Four blisters alongside shells.
Natural Blisters with Partially Filled Areas

Blisters examined in the Bangkok lab have been treated with an artificial filler.

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Pinpoint flux cloud in synthetic diamond.
Yellow Synthetic Diamond with Nickel-Related Green Fluorescence

A specimen seen in the New York lab shows features not usually seen in synthetic diamond.

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Round brilliant diamond showing bright red fluorescence.
Natural Colorless Type IIa Diamond With Bright Red Fluorescence

Red fluorescence, rarely seen in natural colorless type IIa diamond, is observed at the New York lab.

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