Arizona Mined Turquoise Titanium Stud Earrings. These Stud earrings are handmade with Genuine Arizona Mined Turquoise Cabochons and Grade 23 Hypoallergenic Titanium. Available in 4 and 6mm diameters. They are extremely durable and the post is "bend proof". Comes with two sizes of Titanium backs for preference. 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.