925 Sterling Silver Stud Earrings - Half Carat Cubic Zirconia Earrings - 25 Ct Round Cubic Zirconia Half a Carat Total weight. Silver Stud Earring 0.25 Each Stone Nickel Free & Tarnish Free Material 925 Stamped Top AAAAA Quality Lab Created Cubic Zirconia Round Stone Free 3rd Backing Total of 3 Backings With This Order