Thank you for viewing! Vivienne Westwood CONDUIT STREET Ring Purchased at a store about 2 years ago. No accessories, ring only. Measured with a ruler, it's approximately 18.3mm, and according to a ring measurement app, it's size 17 (Japanese size). (Measured by an amateur) I don't know the official size. Please check the images. It fits my thumb with a little room. It stops at the knuckle. (Female) This is a used item that has been in someone's hands. If you are concerned about minor details or are looking for a perfect condition item, please refrain from purchasing. It will be wrapped in packing material and shipped via courier. If you have any questions, please be sure to comment before purchasing. Vivienne Ring Jewelry