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Eight HPHT faceted synthetic diamonds from AOTC Group

Near-Colourless HPHT Synthetic Diamonds from AOTC Group

Ulrika F.S. D’Haenens-Johansson, Kyaw Soe Moe, Paul Johnson, Shun Yan Wong, Ren Lu, and Wuyi Wang, April 30, 2014

Presents the gemmological and spectroscopic properties of a suite of synthetic diamonds grown by AOTC using high pressure and high temperature.

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.

A Look Inside a Remarkably Large Beaded South Sea Cultured Pearl

Laura M. Otter, Ursula Wehrmeister, Frieder Enzmann, Martin Wolf, and Dorrit E. Jacob, April 30, 2014

A study of the nacre and the cavity of a large Pinctada maxima cultured pearl yields a theory on the specimen’s formation.

Blue sapphires from the Baw Mar Mine in Mogok

Hpone-Phyo Kan-Nyunt, Stefanos Karampelas, Klemens Link, Kyaw Thu, Lore Kiefert, and Pierre Hardy, January 31, 2014

Reports on the microscopic, chemical and spectroscopic features that differentiate the high-quality Baw Mar sapphire from “classic” gem-quality Burmese sapphire.

The Seven Types of Yellow Sapphire and Their Stability to Light

Kurt Nassau and G. Kay Valente, December 1, 1987

The authors determined that there are actually seven types of "yellow" sapphire on the market today, which differ in the cause of colour and the stability of the colour to light.

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