Yellow HPHT-Processed Rough Diamond
HPHT annealing of a nearly eye-clean yellow natural rough diamond is revealed through spectroscopic analysis.
LPHT-Annealed Pink CVD Synthetic Diamonds
The New York lab examines three pink CVD synthetic diamonds which have received LPHT annealing treatment.
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.
Very Large Irradiated Yellow Diamond
A very large diamond with a Fancy Vivid yellow colour was identified as artificially irradiated.
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.