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HPHT-processed yellow rough diamond.
Yellow HPHT-Processed Rough Diamond

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

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LPHT-annealed CVD synthetics with their DiamondView images
LPHT-Annealed Pink CVD Synthetic Diamonds

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

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

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Group of intensely coloured round yellow diamonds
Screening of Small Yellow Diamond Melee for Treatment and Synthetics

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

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Fancy Vivid yellow diamond
Very Large Irradiated Yellow Diamond

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

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DiamondView fluorescence Images
Three CVD Synthetic Diamonds Submitted to Mumbai Laboratory

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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