My girlfriend and I are going back to her home in Denmark on Valentines day and coming back on the 17th and whilst we are away, I'm going to propose. Her family all know about this, and are behind me 100%. However, I don't know her ring size, and nobody else does either. She wears rings quite a lot, but never any of her ring finger, mostly just on her middle finger. I want it to be a surprise, so I can't just measure her finger either. Is there any other way of finding out her ring size?
P.S. The ring I plan to propose with is probably not the one we'll use forever. We've always said if we were to get married we would get custom rings.