Arizona Mined Turquoise Ring. This handmade ring features a Arizona Mined Turquoise stone bezel mounted on a 5mm wide 925 Sterling Silver Flower pattern band.Average rings are 2 to 2.5mm wide. With wider bands such as this it is generally advised to increase the ring size by 1/2 size. 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.