Irradiated Green-Blue CVD Synthetic Diamonds
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.
Largest Blue HPHT Synthetic Diamond
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
A parcel revealed to contain natural, treated and synthetic diamonds reinforces the importance of identification.
Near-Colourless Melee-Sized HPHT Synthetic Diamonds Identified in GIA Laboratory
The Bangkok lab examines near-colourless HPHT synthetic diamonds in melee sizes.
Yellow CVD Synthetic Diamond
A Fancy yellow type Ib CVD-grown synthetic diamond undergoes testing at the New York lab.
CVD Synthetic Diamond with Unusual Inclusions
Examination of a CVD synthetic diamond with an unusual pattern of growth dislocations that resemble natural inclusions.
Long-Term Durability of CVD Synthetic Film on Natural Diamond
A natural diamond with a CVD synthetic film is examined at GIA's Carlsbad lab.
Mixed-Type HPHT Synthetic Diamond with Unusual Growth Features
Although this stone bore some superficial resemblance to moissanite, its gemmological properties were consistent with HPHT synthetic diamond.
A Larger, Higher-Quality NPD Synthetic Diamond
GIA’s New York laboratory recently detected an undisclosed NPD synthetic diamond, a 1.51 ct Fancy Black round.
Natural Colourless Type IaB Diamond with Silicon-Vacancy Defect Centre
Examination revealed a rare instance of a silicon-vacancy defect in natural diamond.