Navy: Mens 5.0ct Simulated Sapphire USA Navy Military Signet Ring 316 Stainless Steel, 3061 sz 13.5. Navy: This handsome US Navy Ring makes an ideal gift for any current or retired Sailor! Carefully handcrafted from solid 316L Stainless Steel, this rugged and handsome ring is made to last! This stunning design features a large 5.0 carat Simulated Blue Sapphire gemstone bordered by the words United States Navy. The sides are engraved with Navy symbols for honor, courage and commitment.