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Rare Faceted Wurtzite

Amy Cooper and Nathan Renfro, July 25, 2014

A stone submitted for identification is revealed to be the first wurtzite examined by the GIA lab.

Screening of HPHT Synthetic Melee With Natural Diamonds

Ivana Petriska Balov and Paul Johnson, November 7, 2016

A screening service allows the lab to screen for synthetic material in diamond melee parcels.

Yellow CVD Synthetic Diamond

Kyaw Soe Moe, Wuyi Wang, and Ulrika D’Haenens-Johansson, July 25, 2014

A Fancy yellow type Ib CVD-grown synthetic diamond undergoes testing at the New York lab.

Tenebrescent Zircon

Ratima Suthiyuth, July 25, 2014

Colour modification is observed in a reddish orange zircon at the Bangkok laboratory.

Chameleon Diamond with Nickel Absorption Band

Troy Ardon, July 25, 2014

A rare chameleon diamond is examined in GIA's Carlsbad lab.

Flux-Grown Synthetic Ruby with Hydrothermal Synthetic Seed Crystal

Ziyin Sun and Dino DeGhionno, July 25, 2014

An unusual synthetic ruby, combining a hydrothermal ruby seed and flux ruby overgrowth, is examined at the Carlsbad lab.