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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.

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.

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.

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.

<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.

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.

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.

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.

Two Tridacna species shells with blister pearls.

Partially Hollow Tridacna Blister Pearls with Shells Attached

Nanthaporn Somsa-ard, Areeya Manustrong, and Joyce WingYan Ho, August 7, 2017

Blister pearls attached to shells are seen in both the Bangkok and the New York laboratories.

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