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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.

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.

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Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics

Russell Shor, June 12, 2015

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

Group of intensely coloured round yellow diamonds

Screening of Small Yellow Diamond Melee for Treatment and Synthetics

Wuyi Wang, Martha Altobelli, Caitlin Dieck, and Rachel Sheppard, January 30, 2015

Melee diamonds can be efficiently screened for synthesis and treatment using infrared absorption spectroscopy, DiamondView imaging and microscopy.

Very Large Irradiated Yellow Diamond

Wuyi Wang, January 30, 2015

A very large diamond with a Fancy Vivid yellow colour was identified as artificially irradiated.

Three CVD Synthetic Diamonds Submitted to Mumbai Laboratory

Ulrika D’Haenens-Johansson

The gemmological and spectroscopic characteristics of these type IIa synthetic diamonds suggested that they experienced different growth and/or treatment histories.

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