The French Blue and the Hope: New Data from the Discovery of a Historical Lead Cast
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.
The Wittelsbach Blue
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.
Latest-Generation CVD-Grown Synthetic Diamonds from Apollo Diamond Inc.
High-quality CVD-grown diamonds, comparable in colour and clarity to natural diamonds, can be identified using a combination of gemmological and spectroscopic properties.
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.
A Gemological Pioneer: Dr. Edward J. Gübelin
During a career that spanned more than 65 years, the eminent Swiss gemmologist Dr. Edward J. Gübelin (1913–2005) built a monumental legacy.
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.
G. Robert Crowningshield: A Legendary Gemmologist
G. Robert (Bob) Crowningshield has made many significant contributions to the study of gems and the science of gemmology.
The Ultimate Gemmologist: A Tribute to Richard T. Liddicoat
On this occasion—the celebration of Richard T. Liddicoat’s 50 years of guiding Gems & Gemmology—it is fitting to review his enormous impact on the field of gemmology.
Jeremejevite: A Gemmological Update
The submission of a large (4.54 ct) jeremejevite of an unusual—yellow—colour to the AGTA Gemmological Testing Centre prompted a search of the available gemmological literature.
Modelling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Fire, and More about Brilliance
This second major article in a three-dimensional modelling study analyses fire – the visible extent of light dispersed into spectral colours.