Purplish Pink Spinel from Tajikistan: Before and After Cutting
Read MoreA look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
Read MoreAnalyses the chemical composition and inclusion characteristics of this ancient artefact.
Read MoreA look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.
Read MoreDetails the process used by Wiede’s Carbidwerk to produce star synthetic corundum from the mid-1950s until the 1970s.
Read MoreHardstone figures of two Russian imperial bodyguards, commissioned in 1912 by Nicholas II, demonstrate the House of Fabergé’s meticulous detail and craftsmanship.
Read MoreThe 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 MoreG. Robert (Bob) Crowningshield has made many significant contributions to the study of gems and the science of gemmology.
Read MoreThe proper use and limitations of IR spectroscopy for identifying natural versus synthetic amethyst of various types have been investigated, focusing on the region 3800–3000 cm-1.
Read MoreDuring a career that spanned more than 65 years, the eminent Swiss gemmologist Dr. Edward J. Gübelin (1913–2005) built a monumental legacy.
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