We offer complimentary resizing for all Tiffany engagement ring purchases. To have your ring resized, visit a Tiffany store with your engagement ring or use the complimentary shipping label included with your purchase to send it out for resizing. While there are no restrictions on resizing, we recommend against resizing your ring multiple times. If you are unsure of your ring size, view our size guide or visit a Diamond Expert at your nearest Tiffany store to have your ring size measured.