Our St. Christopher signet ring, shown here in the aqua color, are a made-to-order item. This sterling silver ring uses the 15mm St. Christopher, so all you have to do is pick your favorite color and indicate ring size. If you need assistance with sizing or have questions, please call us at 1-800-965-1242. Not sure what size finger you are? Try downloading this ring sizer to give you an idea. *Please note, this is only an estimate. For best results, coming into the store and having one of our associates get the size is best. Please note, made-to-order items may take 7-10 days for delivery. If this is needed for Christmas, please place order before December 16. Thank you.