2.25mm Sterling Silver and 14k Stackable Expressions Sterling Silver Blue Topaz Ring - Size 5 - in Sterling Silver - Band Width: 2.25 mm - Finish: Polished - Feature: Solid Polished ; Prong set - 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: blue topaz ] - Usually irradiated and heated to produce color. Some topaz may be coated with a thin film of minerals applied through heat. ::: [ Care and Handling: blue topaz ] - Clean with warm soapy water and a soft brush or cloth. :::