Sterling Silver Lab Simulated Turquoise Inlay Ring - Size 7 - in Sterling Silver - Band Width: 5.03 mm - Width of Item: 5.03 mm - Finish: Polished - Feature: Solid - Feature 2: Closed Back - All of our jewelry for women and men are authenticated with a 10K or 14K hallmark and are tested to pass FTC regulations. ::: [ Potential Enhancement Methods: turquoise ] - Usually stabilized with plastic to enhance durability. Sometimes powdered material is compressed with a binding agent under extreme pressure and heated to bind together small pieces of natural material into a larger whole. Dyed to enhance color. ::: [ Care and Handling: turquoise ] - Do not use ultrasonic cleaner or steamer. Avoid contact with cosmetics, hair spray, perfume and household chemicals. Clean with a damp cloth or soft brush. :::