Sterling Silver Diamond Accent Heart Pendant Necklace on an 18 in. Chain 2 Genuine Diamonds Sterling Silver Heart with an 18 inch Sterling Silver Chain The heart itself measures 5/8 inches high. All of our diamond suppliers and MLG state that to the best or their/our knowledge that all of our diamonds are conflict free. The pendant contains two (2) diamonds. The rest of the heart is sterling silver with illusion or sparkle plates.