Sterling Silver and Three-Stone Black Diamond Heart Pendant Necklace (1/10 cttw), 18" Shining sterling silver forms the foundation of this classic heart pendant necklace, and the black diamond accents add a gleaming glamorous detail, making this a certain favorite addition to her jewelry collection. All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free. Carat weight listed is the total for all stones.