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This 15.32 ct cushion modified brilliant is the largest HPHT synthetic diamond graded by GIA.
15 Carat HPHT Synthetic Diamond

A synthetic diamond seen in the Carlsbad lab is the largest faceted lab-grown diamond examined by GIA.

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Within a parcel of 1,102 diamond melee, 1,092 were identified as HPHT synthetics.
One Natural Melee Diamond Found in Large Batch of HPHT Synthetic Melee

A single natural diamond is found within the largest percentage of undisclosed synthetic melee submitted to GIA.

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Irradiated CVD synthetic diamonds.
Three Irradiated CVD Synthetic Diamonds

Irradiated CVD-grown diamonds are examined in the Carlsbad lab.

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10.08 ct HPHT synthetic diamond with color equivalent to Fancy Deep blue
Blue HPHT Synthetic Diamond Over 10 Carats

Results from GIA’s recent testing of a 10.08 ct blue HPHT synthetic diamond, the largest HPHT synthetic recorded to date.

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5.19 ct CVD synthetic diamond
CVD Synthetic Diamond Over 5 Carats Identified by GIA

Results from GIA’s recent testing of a 5.19 ct CVD synthetic diamond, the largest it has examined to date.

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Greenish yellow doublets.
Synthetic Sapphire and Synthetic Spinel Doublets

Unusual doublets created from two different synthetics are revealed at the Carlsbad laboratory.

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Largest blue HPHT synthetics
Large Blue and Colourless HPHT Synthetic Diamonds

Five large HPHT synthetic diamonds, examined at GIA’s Hong Kong lab, indicate the advances that HPHT growth technology has made in quality and size.

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Six HPHT yellow melee diamonds
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.

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5.03 ct Fancy Deep Blue HPHT Synthetic Diamond
Largest Blue HPHT Synthetic Diamond

Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.

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Green-blue CVD synthetic diamonds.
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.

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