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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.

Yellow HPHT-Processed Rough Diamond

Sally Chan, November 23, 2015

HPHT annealing of a nearly eye-clean yellow natural rough diamond is revealed through spectroscopic analysis.

Irradiated Green-Blue CVD Synthetic Diamonds

Kyaw Soe Moe, Ulrika D’Haenens-Johansson, and Wuyi Wang, November 23, 2015

Advancing CVD growth technologies yield intensely coloured, high-quality synthetic diamonds, such as the two green-blue synthetic materials seen in the New York lab.

Cape Diamond with Yellow Phosphorescence

Kyaw Soe Moe, Jon Neal, and Paul Johnson, May 8, 2017

A cape diamond examined in the New York lab shows rare yellow phosphorescence.

Round brilliant diamond showing bright red fluorescence.

Natural Colourless Type IIa Diamond With Bright Red Fluorescence

Wasura Soonthorntantikul and Wuyi Wang, August 3, 2016

Red fluorescence, rarely seen in natural colourless type IIa diamond, is observed at the New York lab.

LPHT-annealed CVD synthetics with their DiamondView images

LPHT-Annealed Pink CVD Synthetic Diamonds

Kyaw Soe Moe, Ulrika D’Haenens-Johansson, and Wuyi Wang, July 31, 2015

The New York lab examines three pink CVD synthetic diamonds which have received LPHT annealing treatment.

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.

Analysis of Yellow Diamond Melee for Colour Treatment and Synthetics

Caitlin Dieck, Manisha Bhoir, and Paul Johnson, April 28, 2016

A parcel revealed to contain natural, treated and synthetic diamonds reinforces the importance of identification.

Fancy gray-purple type IIb diamond seen in the Carlsbad lab

Rare Type IIb Grey-Purple Diamond

Sally Eaton-Magaña, July 31, 2015

A natural type IIb diamond with rare colour and very strong 776.4 nm PL peak is seen at the Carlsbad lab.

Six near-colorless HPHT synthetic melee diamonds

Near-Colourless Melee-Sized HPHT Synthetic Diamonds Identified in GIA Laboratory

Wasura Soonthorntantikul and Piradee Siritheerakul, July 31, 2015

The Bangkok lab examines near-colourless HPHT synthetic diamonds in melee sizes.

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