Amethyst from Boudi, Morocco
An introduction to Moroccan amethyst, which features distinctive color zoning and inclusions.
Update on Ammolite Production from Southern Alberta, Canada
There have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.
Gem Localities of the 1990s
The 1990s saw growth in gem exploration, production and marketing worldwide.
Diamonds in Canada
This article chronicles the discovery of primary diamond deposits throughout Canada, whose increasing supply of rough stones will have a growing impact on the world diamond industry.
Sapphires from Thammannawa, Kataragama Area, Sri Lanka
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.
Abstracts; Summer 2009
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.
Amethyst from Four Peaks, Arizona
For more than a century, the Four Peaks mine in Maricopa County, Arizona, has produced gem-quality amethyst.
Lapis Lazuli from the Coquimbo Region, Chile
Lapis lazuli has been mined from the Coquimbo Region of Chile since 1905.
Gem Rhodochrosite from the Sweet Home Mine, Colorado
New mining techniques have combined state-of-the-art equipment and technology to detect and extract large, fine-quality rhodochrosite specimens and gem rough.
Status of Ruby and Sapphire Mining in the Mogok Stone Tract
This 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.