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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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The Wittelsbach Blue

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

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Diamond Polish and Symmetry: Guide to GIA Terminology and Abbreviations

Every GIA diamond grading report contains an assessment of a diamond’s polish and symmetry, which are contributing factors in determining the overall quality of a diamond’s finish. This guide explains each polish and symmetry feature, along with their abbreviations and the possible locations of polish features on the diamond.

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Characterizing Natural-Color Type IIB Blue Diamonds

More than 400 blue diamonds were studied at the GIA Gem Trade Laboratory over several years to reveal additional information about the relationships between their color, clarity, and other gemological properties.

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Diamonds from the Argyle Mine
An Economic Review of the Past Decade in Diamonds

The diamond industry was buffeted by extreme price volatility during the last decade, unlike any encountered since the Great Depression of the 1930s.

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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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Legal Protection for Proprietary Diamond Cuts

Considerable confusion exists in the trade about the important differences between trademarks and patents.

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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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Diamond with Unusual Laser Manufacturing Remnant

An unusual laser manufacturing remnant, possibly once used to guide a gem cutter, was left behind in a clock-like shape.

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