MATERIALS: All necklaces are pure .925 silver and are stamped to ensure premium quality.CHAIN LENGTH: 30 inches The North Star Necklace is a reminder to stay True to Yourself, in a world where we are fed far too much information and advices on how to live, our heart is our only True North Star... this necklace has details of roman numerals and layered dials plus the black diamond to complete this unique statement piece.