Botswana’s Scintillating Moment
Examines the history of diamond production in Botswana and the long-term outlook for beneficiation through value-added industries.
Colour Grading “D-to-Z” Diamonds at the GIA Laboratory
This article discusses the history and ongoing development of GIA's colour grading system, and explains how its laboratory applies it.
A History of Diamond Treatments
Modern gemmologists and diamantaires are faced with a broad spectrum of colour and clarity treatments ranging from the simple to the highly sophisticated.
Global Rough Diamond Production Since 1870
Historically, global rough diamond production has fluctuated greatly due to a myriad of causes, many of which are explored in this article.
The Cullinan Diamond Centennial: A History and Gemmological Analysis Of Cullinans I And II
Eight decades after the Cullinan diamond was mined, a team of gemmologists examined the two famous gems that were created from it to become part of the Crown Jewels of England.
Experimental CVD Synthetic Diamonds from LIMHP-CNRS, France
In the last decade, progress in diamond growth by chemical vapour deposition (CVD) has resulted in significant improvement in the quality of synthetic single crystals.
A Gemmological Study of a Collection of Chameleon Diamonds
Chameleon diamonds are among the rarest of gem diamonds.
An Updated Chart on the Characteristics of HPHT-Grown Synthetic Diamonds
A new chart, supplementing the one published in the Winter 1995 issue of Gems & Gemmology, summarises the features of both as-grown (“non-modified”) and treated (“modified”) synthetic diamonds currently in the gem market.
A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds
The GIA diamond cut grading system described here includes the components of brightness, fire, scintillation, polish and symmetry, as well as weight and durability concerns, into a single overall grade for cut quality for standard round brilliants.
Identification of Synthetic Diamond Grown Using Chemical Vapour Deposition (CVD)
This article presents information about the CVD process, the history of its development, and properties that differentiate the resulting synthetic crystals from natural diamond.