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Research
HPHT-Processed Natural and Laboratory-Grown Diamonds with Counterfeit Inscriptions
The Dubai laboratory reports on four diamonds inscribed with fraudulent GIA report numbers.
Unusual Patterns in Diamonds Composed of Dark Micro-Inclusions
Two natural diamonds exhibiting dark micro-inclusions are compared in the Carlsbad laboratory.
Rose-Shaped Cloud Inclusion in Diamond
A cluster of cloud inclusions in diamond forms a petal-like structure resembling a rose.
CVD Laboratory-Grown Gem Diamonds from Plasmability
A report from the New York laboratory on colorless and near-colorless CVD gem diamonds produced by the Texas-based company Plasmability.
CVD-Grown Diamond with an Unusual Blue Band
An HPHT-treated CVD-grown diamond displaying a blue growth band is examined in the Mumbai laboratory.
Checkered Pattern on Diamond
The Mumbai laboratory examines a modified pear portrait-cut natural diamond.
“Out of the Darkness” …and Into the Light of Diamond Fluorescence
A unique art piece crafted with more than 9,200 diamonds is examined at GIA’s Carlsbad laboratory.
Colored Bands in CVD-Grown Diamond
A CVD-grown diamond submitted to the Surat laboratory exhibits a growth remnant appearing as a colored band.
Observations of Oval-, Pear-, and Marquise-Shaped Diamonds: Implications for Fancy Cut Grading
Presents findings from observations of oval-, pear-, and marquise-shaped diamonds, laying the groundwork for a fancy cut grading system.
Classification of Gem Materials Using Machine Learning
Explores the application of several machine learning models to complement traditional gem classification approaches.
