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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.

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.

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.

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.