Tips for Finding Her Ring Size
Best Case –Borrow the real thing
The safest course of action is to bring in one of her rings. This is often hard to do without raising suspicion. If you can’t borrow a ring for an afternoon, try offering to take her jewelry to be cleaned.
Next Best Case –Make a trace
Trace the inside of the ring on a piece of paper. This can be used to create an accurate measurement.
If you can’t do the above -Try her ring on yourself
Put one of her rings on your own finger. Push it down as far as it will go and then mark the spot with a pen. Then just show us the marking and we can measure it for you.
If all else fails – Ask a friend
A friend of your loved one can be of great assistance in this particular endeavor. It's not uncommon for one friend to ask another for their ring size as a matter of curiosity. Just be sure you choose a friend who can keep a secret.