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Two Natural “Horse Conch” Pearls

Bona Hiu Yan Chow, August 9, 2018

Rare pearls, along with their shell, are studied in the Hong Kong lab.

Unique Star Sapphire with Transparent Core

Yusuke Katsurada, August 9, 2018

A sapphire cabochon with an unusual appearance is seen at GIA’s Tokyo lab.

A Cat’s-Eye Rock Consisting of Jadeite and Amphibole

Bona Hiu Yan Chow, August 9, 2018

Raman spectroscopy reveals that a green bead, showing chatoyancy on one side, comprises jadeite and amphibole.

Shells cut into cabochons, along with an intact shell.

Cabochons Fashioned from the Shell of Crassostrea Virginica

Artitaya Homkrajae, August 9, 2018

The Carlsbad lab examines gem materials fashioned from American oyster shells.

Synthetic ruby overgrowth on natural sapphire seed.

Two Unusual Natural Sapphires with Synthetic Ruby Overgrowth

Tyler Smith and Hollie McBride, January 26, 2018

For the first time, the Carlsbad and New York labs see natural sapphire seeds with synthetic ruby overgrowth.

Diamond with uneven “lizard skin” surface texture.

Lizard Skin on Deformed Diamond

Evan M. Smith and Paul Johnson, January 26, 2018

The surface texture of a diamond is affected by the gemstone’s structure.

Alexandrite cabochon in fluorescent (left) and incandescent light (right).

Cat’s-Eye Alexandrite with Unique Inclusion Pattern

Makoto Miura and Yusuke Katsurada, January 26, 2018

Examination of a chatoyant alexandrite cabochon.

<em>Gota de Aceite</em> in an emerald from Zambia.

Gota de Aceite in a Zambian Emerald

Nicole Ahline, January 26, 2018

A phenomenon usually seen in Colombian emeralds is found in a specimen from Zambia.

Sub-hexagonal etch pits in synthetic moissanite.

Synthetic Moissanite Imitating Rough Diamond

Rebecca Tsang, January 26, 2018

A light green specimen, submitted as a rough diamond, is actually a synthetic moissanite.

Intense Blue Diamond with Very High Boron Concentration

Paul Johnson and Wuyi Wang, July 31, 2015

A natural Fancy Intense blue diamond submitted to the New York lab shows the highest boron concentration ever reported in a natural specimen.

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