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Recently discovered and legendary diamonds in the blue/gray/violet color range
Natural-Colour Blue, Grey and Violet Diamonds: Allure of the Deep

Summarises data collected on more than 15,000 natural blue/grey/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this colour range.

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Fancy Dark brown to Fancy black Marange diamonds
Black Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions

Characterises a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.

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Rough CLIPPIR diamonds
The Very Deep Origin of the World’s Biggest Diamonds

Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular and Resorbed), that formed in a super-deep environment.

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Coloured Diamonds in the Aurora Butterfly of Peace Collection
The “Type” Classification System of Diamonds and Its Importance in Gemmology

Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.

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Colour Grading “D-to-Z” Diamonds at the GIA Laboratory

This article discusses the history and ongoing development of GIA's colour grading system, and explains how its laboratory applies it.

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

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

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A Gemmological Study of a Collection of Chameleon Diamonds

Chameleon diamonds are among the rarest of gem diamonds.

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An Important Exhibition of Seven Rare Gem Diamonds

The stories behind seven strikingly beautiful rare natural diamonds, united in an exhibit at the Smithsonian, are told here.

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

This second major article in a three-dimensional modelling study analyses fire – the visible extent of light dispersed into spectral colours.

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Discovery and Mining of the Argyle Diamond Deposit, Australia

Australia’s Argyle mine has set records for volume since its establishment in 1983, and is additionally noted for its rare pink diamonds.

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