Blue Diamond Sterling Silver Stud Earrings (1/5cttw) .925 Sterling Silver Natural diamonds are treated by irradiation to produce a variety of fancy colors including hues of blue. This process is permanent and does not alter any other property of the diamond except the color. The total carat weight of the 2 stones is 0.20 CT All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free.