Brand NEW Men's Black Diamond Tennis Necklace The Base Metal is Solid Sterling Silver with a layer of Black Rhodium Plating on the outside. Black Rhodium is a type of Platinum that is darker and more rare. Rhodium does not easily rust or lose its shine. These properties of durability, luster, and inertness make it the perfect metal for plating other metals like Sterling Silver Genuine 2ct Lab Created Black Brilliant Cut Diamonds Available Sizes: Length - 18" - 20" - 24" Width 5MM Retail Price $500 Buy with confidence from a Top Rated Seller w/ a 99%+ Feedback Rating! A2291 (ID-248)