Thursday, 19 October, 2017
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GIA warns of ‘hybrid’ diamonds

The Gemological Institute of America (GIA) has warned of “hybrid” diamonds entering the supply chain after uncovering a natural diamond with a blue synthetic coating.

Claiming that the stone was the first of its kind that the institute had encountered, it reported that a number of “unusual characteristics” gave away the gem’s synthetic nature.

It had both nitrogen and boron defects, which were described as a “rare combination”, and was also uncommonly a mixed Type Ia and IIb.

The ‘natural-synthetic’ gem was sent to the GIA’s New York lab as a natural fancy 0.33-carat blue diamond.

The stone has silicon deficiency defects, which although found in natural diamonds, had a unique combination of sharp boundaries, fluorescence, phosphorescence and sIV which suggested it was a chemical vapour deposition (CVD) synthetic.

The GIA stated that it was likely that there would be more discoveries of similar diamonds.

Its statement said: “Identification of colored diamonds should be performed very carefully by looking for unusual characteristics, such as a straight boundary line associated with an interface plane, and fluorescence zones with sharp edges in DiamondView images.

“Examination of this fancy-coloured composite diamond indicated that similar challenges could exist for colourless and near-colourless diamonds.”

About Shekina Tuahene

Shekina Tuahene
Shekina is a multimedia journalist who has lived in London all her life. She is an alumnus of University of Greenwich and Brunel. Shekina loves to read, travel, socialise and listen to music. If you have any story or feature ideas, feel free to drop her a line.

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