Arizona Mined Turquoise Ring This handmade ring features a 5mm natural Arizona Mined Turquoise stone, bezel mounted on a 3.5mm wide 925 Sterling Silver Vine 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.