Take the guesswork out of shopping for engagement rings. Make sure you're buying the right size wedding and engagement rings for your significant other with our free ring sizer. Simply fill out the short form below for the free ring sizer from Danforth Diamond. It should arrive at your address within 3-5 business days, giving you plenty of time to shop our diamond engagement rings to find the right one for the love of your life. Fill out the short form below for your FREE ring sizer from Danforth Diamond. It should arrive at your address within 3-5 business days.