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Fancy-color diamonds from Lomonosov, Russia.
Geology and Development of the Lomonosov Deposit, North-Western Russia

Reviews diamond discoveries at the Lomonosov deposit, as well as the geology of the Arkhangelsk kimberlite province.

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Gemmological characteristics of coated jadeite jade

Analyses the effects of coating on green jadeite specimens using DiamondView imaging, microscopy, spectroscopy and Raman spectrophotometry.

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Winter 2011 G&G Lab Notes

This section, from the Winter 2011 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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GemCad View of the French Blue Enclosed Within the Tavernier Blue
A Crystallographic Analysis of the Tavernier Blue Diamond

This study uses both historical information and modern data to create a computer model of the Tavernier Blue, orienting the finished diamond within the original diamond crystal.

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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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Computer Rendering of the “French Blue” Diamond
The French Blue and the Hope: New Data from the Discovery of a Historical Lead Cast

With the use of modern tools and technology, this article sheds light on the history and provenance of both the French Blue and the Hope diamonds.

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The Wittelsbach Blue

This article describes what is known about the Wittelsbach Blue since it was first reported in 1666, and the gemmological information released to date on this diamond.

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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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A History of Diamond Treatments

Modern gemmologists and diamantaires are faced with a broad spectrum of colour and clarity treatments ranging from the simple to the highly sophisticated.

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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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