Article Search Results

Show Filters
Showing 12 results for "*"
Fancy Dark brown to Fancy black Marange diamonds
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.

Read More

Rough CLIPPIR 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.

Read More

10 Study Samples Before and After HPHT Processing
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.

Read More

Whitish Graining with an Amorphous Appearance
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.

Read More

0.20-ct Diamond
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.

Read More

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.

Read More

Rough Synthetic Gem-quality Diamond Crystals
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.

Read More

Natural diamond
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.

Read More

Ruby in Diamond

The first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.

Read More

Diamonds protrude from broken eclogite xenolith
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.

Read More