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Characterization and Grading of Natural-Color Yellow Diamonds

A large number of natural-color yellow diamonds are analyzed using grading and appearance aspects among other characteristics to clarify the differences between them and the light yellow diamonds associated with GIA's D-to-Z color grading scale.

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Gemesis Laboratory-Created Diamonds

High-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemological properties are explicated.

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Characterization and Grading of Natural-Color Pink Diamonds

Known for their great beauty and rarity, pink diamonds have long been sought after by jewelers, collectors, and consumers.

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Modeling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Fire, and More about Brilliance

This second major article in a three-dimensional modeling study analyzes fire – the visible extent of light dispersed into spectral colors.

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10 Study Samples Before and After HPHT Processing
GE POL Diamonds: Before and After

This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.

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Latest-Generation CVD-Grown Synthetic Diamonds from Apollo Diamond Inc.

High-quality CVD-grown diamonds, comparable in color and clarity to natural diamonds, can be identified using a combination of gemological and spectroscopic properties.

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A Discussion on Ruby‐Glass Composites & Their Potential Impact on the Nomenclature in Use for Fracture‐Filled or Clarity Enhanced Stones in General

Describes several rubies treated with glass and experiments on rubies treated with glass, demonstrating that the stones are bonded together by the glass.

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