Lizard Skin on Deformed Diamond
The surface texture of a diamond is affected by the gemstone’s structure.
Cape Diamond with Yellow Phosphorescence
A cape diamond examined in the New York lab shows rare yellow phosphorescence.
Natural Colourless Type IIa Diamond With Bright Red Fluorescence
Red fluorescence, rarely seen in natural colourless type IIa diamond, is observed at 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.
Graphite Inclusions Forming Octahedral Outline in Diamond
An inclusion outlined by minute graphite crystals within a diamond create an octahedral shape.
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.
Yellow HPHT-Processed Rough Diamond
HPHT annealing of a nearly eye-clean yellow natural rough diamond is revealed through spectroscopic analysis.
Near-Colourless Melee-Sized HPHT Synthetic Diamonds Identified in GIA Laboratory
The Bangkok lab examines near-colourless HPHT synthetic diamonds in melee sizes.
LPHT-Annealed Pink CVD Synthetic Diamonds
The New York lab examines three pink CVD synthetic diamonds which have received LPHT annealing treatment.