Amethyst from Boudi, Morocco
An introduction to Moroccan amethyst, which features distinctive color zoning and inclusions.
Amethyst from Four Peaks, Arizona
For more than a century, the Four Peaks mine in Maricopa County, Arizona, has produced gem-quality amethyst.
Amethyst Mining in Brazil
Brazil is currently the leader in overall production of amethyst.
"Damsonite," the trade name for a new type of chalcedony, is analysed and described.
A Status Report on Gemstones from Afghanistan
An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.
Artificially Induced Colour in Amethyst-Citrine Quartz
A new and rather unusual gem material and possible treatments are discussed.