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A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds

The GIA diamond cut grading system described here includes the components of brightness, fire, scintillation, polish and symmetry, as well as weight and durability concerns, into a single overall grade for cut quality for standard round brilliants.

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Possible “Sister” Stones of the Hope Diamond

A recent study compares a specially created model of the Hope diamond with recent computer models of the French Blue to determine if other stones could have resulted from either recutting.

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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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De Beers near Colourless-to-Blue Experimental Gem-Quality Synthetic Diamonds

De Beers has produced a faceted synthetic gem-quality diamond that could go unrecognised without careful gemmological testing.

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Faceting Large Gemstones

The techniques for cutting and polishing gemstone giants.

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15 ct tanzanite
Pleochroism in Faceted Gems: An Introduction

Describes the phenomenon of pleochroism and its complex effect on the appearance of coloured stones.

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An Extraordinary Calcite Gemstone

The unusual effects of dispersion and twinning produced by a calcite gemstone.

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The Rise to Prominence of the Modern Diamond Cutting Industry in India

this article reviews the rise of the modern diamond cutting industry in India and its impact on the world diamond trade

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Curves and Optics in Nontraditional Gemstone Cutting

A series of cuts, designed by the author, exhibit extraordinary optical effects that result from a combination of curved surfaces and plane facets placed to take advantage of internal reflection.

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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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