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A face-up view of a cushion cut diamond with blue color.
Article
Gems & Gemology’s 7 Most Unusual Encounters from 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

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The entrance to the GemGenève show featured a large graphic wall.
Article
Trade Hopes for a Bright 2019 Vegas Show

All eyes are on the upcoming jewellery sales events in the US – the Luxury and JCK shows in Las Vegas – as business slows down in other parts of the world.

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A model holds a large cut-corner square diamond with three fingers.
Article
De Beers Ups Supply; US Federal Trade Commission Warns About ‘Eco’ Claims

DeBeers responds to fluctuations, and the FTC issues warnings on laboratory-grown diamonds. Plus: 302.37 ct Graff Lesedi La Rona is revealed.

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Article
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 gemmological information released to date on this diamond.

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Article
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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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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Legal Protection for Proprietary Diamond Cuts

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

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