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G&G Announces Most Valuable Article Awards

The G&G Staff, May 12, 2020

G&G announces the winners of the Dr Edward J. Gübelin Most Valuable Article Awards for 2019.

Man sits at his desk with a display stand of multiple pieces of jewelry in front of him.

Article

Alum’s Lifelong Quest: Searching for Jewellery Unicorns

August 14, 2019

Alan Nacht continues his family’s legacy - Bernard Nacht & Co. – and his quest for unforgettable jewellery.

Article

Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

Russell Shor, February 1, 2016

G&G Brief presents an overview of the content of the Winter 2015 issue of Gems & Gemology.

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.

This microphotograph shows layered growth zoning associated with intense colour zoning in a faceted synthetic alexandrite grown by Creative Crystals Inc.; immersion, field of view 5.3 × 4.0 mm. Photo courtesy of K. Schmetzer, The Journal of Gemmology.

Article

Decades-Old Synthetic Alexandrite Sheds Light on Modern-Day Research Needs

Jennifer Stone-Sundberg, September 1, 2013

An overview and commentary on the 2012 Journal of Gemmology article, “Flux-grown synthetic alexandrites from Creative Crystals Inc.”

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.

Article

Sapphire Series Part 2: The Next Generation of Sapphire Crystal Growth Techniques

Jennifer Stone-Sundberg, August 6, 2013

The second in the series, "Sapphire: A Crystal With Many Facets," this article looks at several advanced growth techniques.

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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