Black Rhodium Sterling Silver Black and White Diamond Double Heart Pendant Necklace (.1 Cttw), 18" Black diamonds add sophisticated sheen to the classic silhouette of this double heart pendant necklace. 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 all stones.