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Suite containing over 36 carats of Yogo sapphire

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.

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.

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.

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.

Sapphires from Antsiranana Province, Northern Madagascar | Gems & Gemology

Dietmar Schwarz, Jan Kanis, September 1, 2000

Since 1996, large quantities of yellow to blue sapphires have been recovered from alluvial deposits derived from basaltic rocks in northern Madagascar.

Ruby and Sapphire from Jegdalek, Afghanistan

Gary W. Bowersox, Eugene E. Foord, June 1, 2000

This study provides detailed mining and gemmological information on the Jegdalek deposit, in east-central Afghanistan, which is hosted by elongate beds of corundum-bearing marble.

Sapphire and Garnet from Kalalani, Tanga Province, Tanzania

Antonin V. Seifert and Jaroslav Hyrsl, June 1, 1999

Located just 3 km south of the famous Umba locality, the geologically similar Kalalani area hosts deposits of gem-quality sapphire.

Rubies and Fancy-Colour Sapphires from Nepal

Christopher P. Smith, Edward J. Gübelin, March 1, 1997

Gem-quality rubies and fancy-colour sapphires have been recovered from dolomite marble lenses located high in the Himalayan mountains of east-central Nepal (Ganesh Himal).

Sapphires from the Andranondambo Region, Madagascar

Dietmar Schwarz, Eckehard J. Petsch, June 1, 1996

Since 1993, large amounts of gem-quality sapphires from the Andranondambo region of southern Madagascar have entered the international gem market.

Sapphires from Southern Vietnam

Christopher P. Smith, Robert C. Kammerling, September 1, 1995

Gem-quality blue to bluish green sapphires from basaltic terrains in southern provinces of Vietnam have been entering the gemstone market since the late 1980s.

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