On my first trip to South Korea after being reunited with my Korean family, my brother who was in The R.O.K. Marine Corps at the time gave me his specially made dog tags composed of silver(dog tags and chain). I am not sure of the purity, but if it is anything like their gold jewelry(24 carat), then it is possibly .999. It weighs in at 3.19 troy oz. The hallmark on the fastener clip says silver. Either way, this is my favorite piece of silver because it was given to me by my Brother, Yoon Hak Joong 21 years ago.