Russell Shor, May 21, 2019
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.
Read MoreRussell Shor, April 22, 2019
DeBeers responds to fluctuations, and the FTC issues warnings on laboratory-grown diamonds. Plus: 302.37 ct Graff Lesedi La Rona is revealed.
Read MoreRudolf Dröschel, Jürgen Evers, and Hans Ottomeyer, December 1, 2008
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.
Read MoreJohn M. King, James E. Shigley, June 1, 2002
Known for their great beauty and rarity, pink diamonds have long been sought after by jewellers, collectors and consumers.
Read MoreJames E. Shigley, Reza Abbaschian, December 1, 2002
High-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemmological properties are explicated.
Read MoreFrançois Farges, March 1, 2009
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.
Read MoreJohn M. King, James E. Shigley, June 1, 2005
A large number of natural-colour yellow diamonds are analysed using grading and appearance aspects among other characteristics to clarify the differences between them and the light yellow diamonds associated with GIA's D-to-Z colour grading scale.
Read MoreJohn M. King, Thomas M. Moses, December 1, 1998
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 colour, clarity and other gemmological properties.
Read MoreWilliam E. Boyajian, September 1, 1988
The diamond industry has been buffeted by extreme price volatility during the last decade, unlike any encountered since the Great Depression of the 1930s.
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