Sterling Silver Rhodium Dark Sapphire Ring - Size 7 - 4.15 Carat Gemstone Weight in Sterling Silver - Band Width: 2 mm - Width of Item: 2 mm - Finish: Polished - Feature: Solid Open back ; Polished - 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: sapphire ] - Usually heated to improve appearance. Occasionally irradiated. Commonly diffused along with heat application to create different colors. Yellow sapphire is always diffused. ::: [ Care and Handling: sapphire ] - Avoid strong detergents, heat, pressure and ultrasonic cleaner or steamer. Avoid re-polishing or re-cutting of the stone. Color may fade in light or with heat. Clean with warm soapy water and a soft brush or cloth. :::