One copper electroformed Southwest Turquoise Ring. These rings are made from Crescent Valley, Carlin Spiderweb, Kingman, Sleeping Beauty and Manassa located in Nevada, Arizona and Colorado. Turquoise mined in the American Southwest is becoming even rarer as most mines have closed down because of rising mining costs, tighter government regulations, and the mines have become depleted of Turquoise. Because of this, Turquoise is becoming rarer than diamonds. Stones measure approximately 12mm. Shape, size, color and pattern may vary as no two stones are alike.