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.
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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.
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Akoya Cultured Pearl Farming in Eastern Australia
Laura M. Otter, Oluwatoosin B. A. Agbaje, Le Thi-Thu Huong, Tobias Häger, and Dorrit E. Jacob, January 26, 2018
Characterises the akoya cultured pearls produced on the eastern shoreline of Australia using native Pinctada imbricata fucata molluscs.
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A New Find of Danburite in the Luc Yen Mining Area, Vietnam
Le Thi-Thu Huong, Laura M. Otter, Tobias Häger, Tim Ullmann, Wolfgang Hofmeister, Ulrike Weis, and Klaus Peter Jochum, January 27, 2017
Reports on a recently discovered eluvial deposit of honey yellow danburite with excellent transparency.
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A New Deposit of Gem-Quality Grandidierite in Madagascar
Delphine Bruyère, Claude Delor, Julien Raoul, Rufin Rakotondranaivo, Guillaume Wille, Nicolas Maubec, and Abdeltif Lahfid, November 7, 2016
Reviews the properties of exceptionally pure grandidierite from a new source.
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Chrysoberyl from the New England Placer Deposits, New South Wales, Australia
Karl Schmetzer, Franca Caucia, H. Albert Gilg, and Terrence S. Coldham, April 28, 2016
Examines a collection of chrysoberyl samples from these sapphire placer deposits to determine their distinct mineralogical and chemical properties.
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Amethyst from Boudi, Morocco
Fabrizio Troilo, Abdelghani El Harfi, Salahaddine Mouaddib, Erica Bittarello, and Emanuele Costa, April 30, 2015
An introduction to Moroccan amethyst, which features distinctive color zoning and inclusions.
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Three-Phase Inclusions in Emerald and Their Impact on Origin Determination
Sudarat Saeseaw, Vincent Pardieu, and Supharat Sangsawong, July 25, 2014
Discusses the role of three-phase inclusions in emerald, in combination with spectroscopy and trace-element analysis, in determining geographic origin.
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Hunting for
“Jedi” Spinels in Mogok
Vincent Pardieu, April 30, 2014
Documents a series of visits to Myanmar in search of exceptionally bright pinkish red spinels possessing no dark tones.
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Update on gemstone mining in Luc Yen, Vietnam
Pham Van Long, Vincent Pardieu, and Gaston Giuliani, January 31, 2014
Explores the emergence of the Luc Yen area as a producer of corundum, spinel, tourmaline and other coloured stones.
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