Winter 2016 - Volume 52, Issue 4
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5.19 ct CVD synthetic diamond
CVD Synthetic Diamond Over 5 Carats Identified by GIA

Results from GIA’s recent testing of a 5.19 ct CVD synthetic diamond, the largest it has examined to date.

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10.08 ct HPHT synthetic diamond with color equivalent to Fancy Deep blue
Blue HPHT Synthetic Diamond Over 10 Carats

Results from GIA’s recent testing of a 10.08 ct blue HPHT synthetic diamond, the largest HPHT synthetic recorded to date.

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HPHT-grown synthetic diamond melee.
Mixing of Natural Diamonds with HPHT Synthetic Melee

Screening reveals a surprise within a batch of synthetic diamond melee.

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Diamond with Coesite Inclusions
Coesite Inclusions with Filaments in Diamond

Inclusions with unusual formation are found in a treated Fancy Vivid yellow diamond.

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Decay Kinetics of Boron-Related Peak in IR Absorption of Natural Diamond

The decay of the transient 2800 cm–1 absorption peak in a Fancy gray diamond is observed.

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Turquoise bead with artificial metallic pyrite.
Turquoise with Simulated Matrix

A turquoise bead is found to have an artificial pyrite and resin matrix.

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DiamondView image of HPHT synthetic showing square pattern.
HPHT-Grown Synthetic Diamond with Strain

Linear strain patterns are found in an HPHT synthetic diamond.

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Tortoiseshell scepter.
Laminated Tortoiseshell Scepter

A scepter made from a rarely submitted material is examined in Hong Kong.

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“Gold sheen” sapphires
Update on Spectroscopy of “Gold Sheen” Sapphires

The chemical composition and spectroscopic characteristics of 14 gold sheen sapphires are examined.

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A green dye concentration observed in beryl.
Dyed Green Beryl

A step-cut beryl is dyed to simulate emerald.

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