Spring 2017 - Volume 53, Issue 1
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Near-colorless HPHT synthetic melee.
HPHT Synthetic Diamond Melee Without Si or Ni Defects

Quality assurance testing in the Bangkok lab reveals HPHT synthetic melee in larger sizes.

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Green HPHT synthetic diamond.
HPHT Synthetic Diamond with Intense Green Color

Nickel is found to contribute to the color of a synthetic diamond seen in the New York lab.

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Wagnerite, thaumasite, and strontianite.
Three Faceted Collector Specimens

Three mineral species, not previously seen in the Carlsbad lab, are examined.

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Pink sapphire with glass filling.
Pink Sapphire Filled with Bismuth-Based Glass

A sapphire with a color not commonly seen in the lab is found to have a glass filling.

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Yellow-green cape diamond.
Cape Diamond with Yellow Phosphorescence

A cape diamond examined in the New York lab shows rare yellow phosphorescence.

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Pink CVD synthetic diamond with H4 defect.
First Observation of H4 Defect in CVD Synthetic Diamond

A CVD-grown diamond examined in the Carlsbad lab yields a surprising find.

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Tubes and fractures associated with pink sleeves.
Rubellite with Incredibly Strong “Pink Sleeves”

Radiation-induced pink sleeves are seen in a rubellite cabochon.

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Orangy red cordierite.
Unusual Dark Orangy Red Cordierite

A cordierite with a color not seen in the GIA lab is examined in New York.

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Photomicrographs of synthetic sapphire.
Multi-Elemental Diffused and Melt-Grown Synthetic Sapphire

GIA examines a multi-elemental diffused and melt-grown synthetic sapphire for the first time.

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Paraíba tourmaline with coating.
Paraíba Tourmaline with Unusual Coating

A coated Paraíba tourmaline is seen for the first time at a GIA lab.

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