Gemmological Characterisation of Sapphires from Yogo Gulch, Montana
Nathan D. Renfro, Aaron C. Palke, and Richard B. Berg, August 6, 2018
A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
Read More
An Early Byzantine Engraved Almandine from the Garibpet Deposit, Telangana State, India: Evidence for Garnet Trade Along the Ancient Maritime Silk Road
H. Albert Gilg, Karl Schmetzer, and Ulrich Schüssler, August 6, 2018
Analyses the chemical composition and inclusion characteristics of this ancient artefact.
Read More
Gem Virtuosos: The Drehers and Their Extraordinary Carvings
Robert Weldon, Cathleen Jonathan, and Rose Tozer, January 26, 2018
A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.
Read More
Synthetic Star Sapphires and Rubies Produced by Wiede’s Carbidwerk, Freyung, Germany
Karl Schmetzer, H. Albert Gilg, and Heinz-Jürgen Bernhardt, November 8, 2017
Details the process used by Wiede’s Carbidwerk to produce star synthetic corundum from the mid-1950s until the 1970s.
Read More
Observations on HPHT-Grown Synthetic Diamonds: A Review
Sally Eaton-Magaña, James E. Shigley, and Christopher M. Breeding, November 8, 2017
Summarises statistical data and distinctive features of several thousand gem-quality HPHT synthetic diamonds examined by GIA from 2007 through 2016.
Read More
Japanese Jadeite: History, Characteristics and Comparison with Other Sources
Ahmadjan Abduriyim, Kazuko Saruwatari, and Yusuke Katsurada, May 5, 2017
Examines the sources, colour, texture and chemical composition of jadeite from Japanese deposits.
Read More
Fabergé Cossack Figures Created from Russian Gemstones
Timothy Adams and Christel Ludewig McCanless, August 3, 2016
Hardstone figures of two Russian imperial bodyguards, commissioned in 1912 by Nicholas II, demonstrate the House of Fabergé’s meticulous detail and craftsmanship.
Read More
Jaipur, India: The Global Gem and Jewellery Power of the Pink City
Andrew Lucas, Nirupa Bhatt, Manoj Singhania, Kashish Sachdeva, Tao Hsu, and Pedro Padua, January 26, 2017
Examines Jaipur’s role as a coloured stone cutting and jewellery manufacturing centre, with profiles of 17 companies and their factory, trading and retail operations.
Read More
Beryllium Diffusion of Ruby and Sapphire
John L. Emmett, et al., June 1, 2003
The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.
Read More
G. Robert Crowningshield: A Legendary Gemmologist
Thomas M. Moses and James E. Shigley, September 1, 2003
G. Robert (Bob) Crowningshield has made many significant contributions to the study of gems and the science of gemmology.
Read More