Sterling Silver Oval Center Simulated Amethyst CZ 10MM Blue Lab Created Opal Ring 925 Sterling Silver, 925 Stamped, Lead and Nickel Free. Women's Sterling Silver Statement Ring. Lab Created Opal; Cubic Zirconia, Face Height 10 Millimeters, Comes in a Cotton Filled Gift Box. Imported from Asia. Quality Assured in Los Angeles, CA USA.