Air Force: Mens 5.0ct Simulated Sapphire USA Air Force Military Signet Ring 316 Steel, 3063 Rugged, handsome and durable Mens USA - US Air Force 316L Stainless Steel Ring Features a 5.0 carat Simulated Sapphire bezel set solitaire. Made with solid Stainless Steel 316L. Made with solid 316L Surgical Stainless Steel so you know that it's made to last!