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Diamonds in Canada
This article chronicles the discovery of primary diamond deposits throughout Canada, whose increasing supply of rough stones will have a growing impact on the world diamond industry.
Star of the South: A Historic 128 Ct Diamond
This article presents the first complete gemological characterization of the historic 128.48 ct Brazilian diamond known as the Star of the South.
Gem-Quality Synthetic Diamonds Grown by a Chemical Vapor Deposition (CVD) Method
Brown-to-gray and near-colorless single-crystal type IIa synthetic diamonds grown using a chemical vapor deposition (CVD) technique by Apollo Diamond Inc. have gemological properties that are distinct from those of both natural diamonds and HPHT-grown synthetic gem diamonds.
Identification of Synthetic Diamond Grown Using Chemical Vapor 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.
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.
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 & Gemology, summarizes the features of both as-grown (“non-modified”) and treated (“modified”) synthetic diamonds currently in the gem market (that is, those grown by the high pressure/high temperature technique).
A Gemological Study of a Collection of Chameleon Diamonds
Chameleon diamonds are among the rarest of gem diamonds.
A Review of the Political and Economic Forces Shaping Today’s Diamond Industry
Political upheavals and technological advances, as well as changes in social and governmental attitudes and initiatives, have produced major and ongoing changes in the diamond industry.
The Cullinan Diamond Centennial: A History and Gemological Analysis Of Cullinans I And II
Eight decades after the Cullinan diamond was mined, a team of gemologists examined the two famous gems that were created from it to become part of the Crown Jewels of England.
The Impact of Internal Whitish And Reflective Graining on the Clarity Grading of D-To-Z Color 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-color diamonds.
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.
Latest-Generation CVD-Grown Synthetic Diamonds from Apollo Diamond Inc.
High-quality CVD-grown diamonds, comparable in color and clarity to natural diamonds, can be identified using a combination of gemological and spectroscopic properties.
