Sterling Silver Simulated Onyx Three Strand Cuff Bangle Bracelet - in Sterling Silver - Product Attributes: - Cuff - Onyx - Polished - Charm/Element Width: 20 mm - Width of Item: 17 mm - Charm/Element Length: 15 mm - Chain Width: 17 mm - Finish: Polished - Feature: Solid 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: onyx ] - Occasionally 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. Always dyed to enhance the color ::: [ Care and Handling: onyx ] - Avoid exposure to extreme light and heat as stones may fade. Clean with warm soapy water and a soft brush or cloth. :::