Summer 2017 - Volume 53, Issue 2
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Rough sapphires from Chila, Ethiopia.
Sapphires from Northern Ethiopia

A new source of sapphires is found in the Tigray region of Ethiopia.

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Raspberry-red grossular garnet in matrix.
Raspberry-Red Garnet with Black Core

Chemical analysis is performed on the black core of a red grossular garnet crystal.

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Starburst Stone is a colorful new devitrified glass.
Colorful Chatoyant Glass

A devitrified glass reminiscent of Victoria Stone is seen during the Tucson gem shows.

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Hues of synthetic cubic zirconia.
Tri-Color-Change Holmium-Doped Synthetic CZ

A synthetic cubic zirconia shows a surprising color change combination under different light sources.

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Beads with submetallic luster.
Chalcedony Beads Coated With Titanium Nitride

Beads in an necklace show a metallic appearance not seen in chalcedony.

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Sango pearls and coral bead.
“Sango Pearl” from Japan

A study of a pink Japanese akoya cultured pearl yields information about the material’s color origin.

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Gem-quality common opal from Mexico.
New Deposits of Gem-Quality Common Opal from Michoacán, Mexico

Material from a new opal deposit in Morelia, Mexico is examined.

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Tektite from Luc Yen with GIA reference collection tektites.
Tektite with a Large Fluid Inclusion

A large tektite found in northern Vietnam is examined in GIA’s Bangkok laboratory.

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Uneven color and blemishes on low-quality cultured pearl necklace.
Dyed Yellow Beaded Freshwater Cultured Pearls Imitating South Sea Cultured Pearls

A yellow cultured pearl necklace is compared to the work of a producer specializing in freshwater pearls of all colors.

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