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.
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.
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.
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.
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.
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.