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The Gemological Institute of America (GIA) has confirmed the details of its new grading system for lab-created diamonds. | Source: Only Natural Diamonds
The Gemological Institute of America (GIA) has confirmed the details of its new grading system for lab-created diamonds. | Source: Only Natural Diamonds

GIA outlines new lab-created diamond certification system

The Gemological Institute of America (GIA) has confirmed the details of its new grading system for lab-created diamonds.

In June, the GIA announced that it would change the language used to describe lab-created diamonds in certificates to better distinguish them from natural diamonds.

The organisation will begin issuing certificates with the new updated format on 1 October, using the terms ‘premium’ and ‘standard’ to describe lab-created diamonds, rather than traditional nomenclature.

These ratings will be determined by the clarity, colour, and cut of the diamonds. Discussing these changes, new CEO Pritesh Patel emphasised that the GIA’s work should reflect market conditions.

Pritesh Patel, GIA senior vice president
Pritesh Patel, GIA senior vice president
"Using descriptive terms for the quality of laboratory-grown diamonds is appropriate, as most fall into a very narrow range of colour and clarity."
Pritesh Patel, Gemological Institute of America

“Using descriptive terms for the quality of laboratory-grown diamonds is appropriate, as most fall into a very narrow range of colour and clarity,” he said.

“Because of that, the GIA will no longer use the nomenclature created for natural diamonds to describe what is a manufactured product.”

To qualify for the ‘premium’ label, lab-created diamonds must be D colour and have a minimum clarity of VVS with excellent polish and symmetry. The ‘standard’ label will be used to describe diamonds with a colour range of between E to J with VS clarity. They must also have a polish rating of ‘very good’, as well as additional symmetry requirements.

Every diamond that meets the GIA’s criteria for a certification will have a laser inscription using the term ‘laboratory-grown’ along with a quality-assessment number. Diamonds that don’t reach the requirements for ‘standard’ will not receive a report.

More reading
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US tariffs cause confusion and temporary change for GIA
GIA makes significant change to lab-created diamond reports

 











Mark McAskill Jewellery
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