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Showing 26 results for "chameleon diamonds"
The round brilliant is the most popular diamond cut. Because of its popularity, assessment of this cut has been the subject of considerable research. Courtesy of Harold & Erica Van Pelt.
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Diamond Cut: The Wow Factor

Learn the basics of the GIA Cut Grading System for round brilliant cut diamonds to help pick out your perfect diamond.

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Modern Diamond Cutting and Polishing

Over the last 25 years, the diamond-cutting industry worldwide has been revolutionised by sophisticated instruments that provide invaluable aid in the process of creating a polished gem.

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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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IMG RN Sothebys Auction 154447 636x358
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Is Another 1,000 (or 3,000) Carat Diamond Around the Corner?

Find out why the number of very large diamonds entering the market has increased sharply in the last few years.

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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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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 Report on the New Watermeyer Split-Facet Diamond Cuts

Introducing a new technique in diamond cutting that virtually eliminates the "bow-tie" effect.

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Today’s round brilliant cut diamonds showcase the gem’s sparkling optics. They’re the most recent expression of a cutting style that has been around for centuries. Photo by Eric Welch, © GIA, courtesy of Signed Pieces, New York
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Describing 58-facet Round Brilliant-Cut Diamonds at GIA

Many beautiful older diamonds are cut to different proportions than modern round brilliants, which makes them a challenge to grade according to modern cut conventions. This article describes how the GIA accommodates these historic gems.

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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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