Sterling Silver Black and White Diamond Heart Pendant Necklace (1/4 Cttw), 18" Sterling silver pendant featuring a 1/2 black diamond and 1/2 white diamond heart All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free. Black diamonds may have been treated to improve their appearance or durability and may require special care. Imported Carat weight listed is the total for all stones.