Sterling Silver and Black Onyx Necklace: measures 1 inch tall (not including the bail) and it is Hallmarked 925 for sterling silver. Comes with a 16 inch 1 mm sterling silver chain (18 inch chain option also available). Comes complete in a black velvet gift box. Shipping and handling is Free within the United States and we offer no-hassle 30 day returns. Questions? Contact us Toll-Free at (877) 544-9887. This makes a great gift, too.