Loading... Please wait...Genuine Black Shell set in sterling silver and accented with Black Diamond & Jet Swarovski crystal. The Black Shell is a natural gemstone and variances should be expected and are considered to be uniquely beautiful. Includes a sterling silver 18" or 20" chain with purchase. Matches our Black Shell, Swarovski Jet & Black Diamond Bracelet and Black Diamond Swarovski Crystal Oval Earrings.