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Diamond

Diamonds are among nature’s most precious and beautiful creations.

Diamond
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Research

Large Natural Diamonds with Asteriated Cloud Inclusions

Two natural diamonds containing cloud inclusions that resemble stars are examined in the Carlsbad laboratory.

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Classification of Gem Materials Using Machine Learning

Explores the application of several machine learning models to complement traditional gem classification approaches.

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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.

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GIA Tests the World’s Second Largest Diamond

360-degree video of the Motswedi diamond.

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Extraordinary Large Bicolor Natural Rough Diamond

A 37.41 ct natural rough diamond with distinct pink and colorless zones is examined at GIA’s Botswana laboratory.

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Eclogite: Diamond-Encrusted Ancient Seafloor

Explores eclogitic diamonds, which make up a significant portion of the gem diamond market, and what they reveal about Earth’s dynamic processes.

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Inclusion Resembling a Gada in Diamond

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Unusual Dumbbell-Like Inclusion in Diamond

Examination of a 0.40 ct near-colorless round brilliant diamond with a large inclusion resembling a dumbbell

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Plastic Deformation: How and Why Are Most Diamonds Slightly Distorted?

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Colored Stones and Pearls | Gems & Gemology

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Rose-Shaped Cloud Inclusion in Diamond

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“Conch Shell” in Diamond

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