Sterling Silver Cubic Zirconia and Lab Created Ruby Stud Earrings - in Sterling Silver - Width of Item: 9.5 mm - Length of Item: 9.5 mm - Earring Closure: Post & Push Back - Earring Type: Button - Finish: Polished - Feature: Solid - All of our jewelry for women and men are authenticated with a 10K or 14K hallmark and are tested to pass FTC regulations. ::: [ Potential Enhancement Methods: cubic zirconia ] - Synthetic. Some are covered with a product that makes the stone more durable. ::: [ Care and Handling: cubic zirconia ] - Clean with warm soapy water and a soft cloth. ::: ::: [ Potential Enhancement Methods: created ruby ] - Grown in a laboratory, but are chemically, physically and optically identical to natural gems. Natural gems typically have inclusions from the crystallization process, where gases and other minerals mix during the molten stage of stone creation. Lab-created stones rely on a steady, controlled proces ::: [ Care and Handling: created ruby ] - Avoid strong detergents, heat, pressure and ultrasonic cleaner or steamer. Avoid re-polishing or re-cutting of the stone. Color may fade in light or with heat. Clean with warm soapy water and a soft brush or cloth. :::