- Take a look at the jewelry she has. When she least expects it, simply borrow one of her rings (one that she wears on her left ring finger) and take it to a jeweler to figure out the size. Then, before she even notices that one of her rings is missing, place it back where it belongs.
- Do some research. If you can’t slyly snatch up one of her rings without her being aware of it, just take a piece of paper, place it along the inside of her favorite ring, and mark down where the paper meets. Once you have this, you can go online and Google ring sizes and compare the results. You could even just take the paper to a jeweler and have them tell you the size that way.
via http://www.betajewelry.com/shopcontent.asp?type=ring
- Ask her mom. Chances are her mother may have gotten her a ring for her sweet 16 birthday or graduation. You never know!
- Too scared to take any of these risks? No problem. If in doubt, size it up! Most rings are able to easily be resized. However, if you have an intricate band and are unsure of whether it can be resized, ask the jeweler.
However you decide to go about finding your future fiancée’s ring size, make sure you are super sneaky about it! You wouldn’t want to ruin such an incredibly romantic surprise, now would you?