Black Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions
Characterises a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.
The Very Deep Origin of the World’s Biggest Diamonds
Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular and Resorbed), that formed in a super-deep environment.
GE POL Diamonds: Before and After
This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.
The Impact of Internal Whitish And Reflective Graining on the Clarity Grading of D-To-Z Colour Diamonds at the GIA Laboratory
This article reviews the GIA Laboratory’s history of reporting on certain types of graining which are often the only characteristics present in large, high-clarity, high-colour diamonds.
A Visual Guide to the Identification of Filled Diamonds
This article illustrates the various features in filled diamonds and explores the best techniques for examining them.
Synthetic Moissanite: A New Diamond Substitute
Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterise it.
Identifying Gem-Quality Synthetic Diamonds: An Update
Synthesised gem-quality diamonds from the General Electric Company are analysed for characteristics that distinguish them from natural stones.
A Chart for the Separation of Natural and Synthetic Diamonds
Exploration of a chart designed to give jewellers and gemmologists a practical guide to identifying synthetic diamonds as they enter the jewellery trade.
Ruby in Diamond
The first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.
Age, Origin and Emplacement of Diamonds: Scientific Advances in the Last Decade
Although certain concepts about the age and formation of diamonds have been known for some time, this overview of advances over the decade leading up to the early 1990s have expanded the scientific understanding of this fascinating topic exponentially.