Arizona Mined Turquoise Ring. This handmade ring features a Genuine 5mm Arizona Mined Turquoise stone, bezel mounted on a 1.6mm wide 925 Sterling Silver Beaded pattern band. Oxidized to a Vintage Silver finish. Ring sizer included. Shipped in gift box. With the Sleeping Beauty mine long closed, American Mined Arizona Turquoise, mined in nearby Arizona regions, offers the same classic sky-blue hue and minimal matrix. Turquoise is one of the birthstones for December.