Black Rhodium Plated Sterling Silver Black and White Diamond Cluster Stud Earrings (.25 Cttw, H-I Color, I3 Clarity) A mix of black and white diamonds make the contrast between the outer halo and inner cluster of these .25 cttw earrings a study in complementary stone setting. Black diamonds may have been treated to improve their appearance or durability. All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free. Imported Carat weight listed is the total for both studs.