We offer free Lifetime Ring Sizing of your Diamondelle purchase. We will be happy to send you a free ring sizer which is the most accurate way for you to determine your ring size prior to purchase. This is especially important if you are ordering an eternity band as re-sizing can be dicey. If you would like to receive a free ring sizer by mail, please contact customer service @ 866-202-0881 and they will be happy to assist you. We appreciate the opportunity to be of service.