Cancer the Crab Necklace: hallmarked 925 for sterling Silver. Measures 0.85 inches wide (22 mm). 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.