Sterling Silver Blue Topaz Ring - Size 7 - in Sterling Silver - Product Attributes: - Blue topaz - Cubic Zirconia - Polished - Solid - Band Width: 2 mm - Width of Item: 2 mm - Finish: Polished - Feature: Solid Open back ; Polished ; Solid - 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: cubic zirconia ] - Synthetic. Some are covered with a product that makes the stone more durable. ::: [ Care and Handling: cubic zirconia ] - Clean with warm soapy water and a soft cloth. ::: ::: [ 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. :::