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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.

A Repaired Diamond

Troy Ardon, August 9, 2018

A marquise-cut diamond is found to have been broken and reassembled with an unknown adhesive.

An exceptionally large and clean 1.91 ct faceted oval brilliant afghanite.

Large Faceted Afghanite

Hollie McBride, August 9, 2018

A report on the largest facet-grade afghanite seen in the GIA gem identification department.

Quartzite dyed to resemble ruby-in-zoisite.

Dyed Quartzite Imitation of Ruby-in-Zoisite

HyeJin Jang-Green, January 26, 2018

Beads appearing to be ruby-in-zoisite are revealed to be dyed quartzite.

Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species

Artitaya Homkrajae, November 7, 2016

Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusc.

Synthetic quartz bangle examined in Bangkok.

Synthetic Rock Crystal Quartz Bangle with Unusual Inclusions

Nattida Ng-Pooresatien, February 1, 2016

A high-quality bangle with two-phase inclusions, similar to natural quartz is found to be synthetic material.

Unusual Coloured Stones

Rebecca Tsang, April 28, 2016

Six rarely seen gemstones are submitted as a parcel to the Carlsbad lab.

Separation of Black Diamond from NPD Synthetic Diamond

Paul Johnson and Kyaw Soe Moe, August 3, 2016

DiamondView is used to differentiate a Fancy black natural diamond from its NPD synthetic counterparts.

5.03 ct Fancy Deep Blue HPHT Synthetic Diamond

Largest Blue HPHT Synthetic Diamond

Kyaw Soe Moe, Paul Johnson, Ulrika D’Haenens-Johansson, and Wuyi Wang, April 28, 2016

Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.

Fluorite Sphere with Phosphorescent Coating

Nathan Renfro, July 31, 2015

A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.

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