A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
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Documents a series of visits to Myanmar in search of exceptionally bright pinkish red spinels possessing no dark tones.
Read MoreSince late 2007, rubies and sapphires have been mined by hand methods from both eluvial and primary deposits at Winza in central Tanzania.
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The past decade saw some impressive discoveries of diamonds and coloured stones.
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The February 2012 discovery of high-quality blue sapphires at Thammannawa near Kataragama in south-eastern Sri Lanka has intensified gem mining and exploration in the surrounding area and all over the country.
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This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
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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.
Read MoreThis article, based on two recent visits to Mogok, briefly reviews the mining history and geology of this extraordinary locality, and describes the current status of mining and the methods used to recover rubies and sapphires in the Mogok area.
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Yogo Gulch, discovered more than 100 years ago, is one of four major sapphire-producing areas in Montana, United States.
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Gem-quality rubies and pink to purple sapphires are being recovered from the Luc Yen and Quy Chau mining regions of Vietnam.
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