Measuring Ring Size

Pulling off a surprise proposal can be a challenge if you need to ask your intended what their ring size is beforehand. Following are some suggestions for determining the correct ring size. Rest assured, if you need to guess, and miss the mark, a resizing is a simple and inexpensive procedure that can be done quickly at any jewelry store. Lumera will also resize the ring at no charge (see details).

How to determine ring size:

  • If you can get possession of a ring that already fits the recipient's third finger, do so. By comparing the ring to the printable ring sizer below, you can accurately determine the correct ring size.
  • If your intended is a heavy sleeper, wrap a string around their third finger and pinch the point where the ends meet. Compare that measurement to the size scale in the printable ring sizer below.
  • Check with a parent or close friend. Often women will have tried on each other's jewelry, or a parent will have purchased a ring in the past.
  • Ask a friend who appears to have similar sized fingers what ring size they wear. This may not be exact, but it will allow you to purchase a ring that fits reasonably well and is easily resized after the proposal.
  • If all else fails, simply choose the size of ring that looks closest from the printable ring sizer below. The most common ring size for a woman is between 5 and 7. Most women can easily accommodate a ring within a half size of their true ring size.


Above all, keep in mind that not knowing the ring size does not have to upset your proposal plan. Just go with your best estimate using the options above, and size up when in doubt. After the proposal, the ring can be correctly sized in no more than a day at most jewelry stores, or at Lumera Diamonds (see details).

Printable Ring Sizer

Print a copy of our free ring sizer, follow the simple instructions and determine the correct ring size.


(Requires Adobe Acrobat Reader. Download it here for free.)