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Suite containing over 36 carats of Yogo sapphire
Gemmological Characterisation of Sapphires from Yogo Gulch, Montana

A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.

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Man Sin mining
Hunting for
“Jedi” Spinels in Mogok

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

Explores the emergence of the Luc Yen area as a producer of corundum, spinel, tourmaline and other coloured stones.

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Blue sapphires from the Baw Mar Mine in Mogok

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

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Ruby and Sapphire from Jegdalek, Afghanistan
Ruby and Sapphire from Jegdalek, Afghanistan

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.

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Sapphire and Garnet from Kalalani, Tanga Province, Tanzania

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

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Sapphires from the Andranondambo Region, Madagascar

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

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Update on Mining Rubies and Fancy Sapphires in Northern Vietnam

Northern Vietnam began producing significant quantities of rubies and fancy sapphires in the late 1980s.

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The Indaia Sapphire Deposits of Minas Gerais, Brazil

The discovery of significant quantities of gem-quality sapphire in Minas Gerais could add corundum to the formidable list of gem species already commercially produced in Brazil.

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The Sapphires of Penglai, Hainan Island, China
The Sapphires of Penglai, Hainan Island, China

The sapphire deposit at Penglai, on Hainan Island, is potentially the largest in China.

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