Both commercial and fine-quality amethyst is mined here since the beginning of 20th century. The mining was inactive for 20 years and started again in 1998. The company that operates the mine markets both rough material and custom-made jewelry. - GIA 2019
Gemstones from Four Peaks Amethyst Mine (Arizona Amethyst Mine), Four Peaks, Maricopa Co., Arizona, USA by Colour
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