Take one of her existing rings to a jewellery store ?
Fill your arse with playdoh then get her to slip you a digit.
You could have course just ask to marry you with a token ring and when you get back take her to the jewellers to pick a proper one.
Thread /
You could have course just ask to marry you with a token ring and when you get back take her to the jewellers to pick a proper one.
Ask her mum, my mum knew my ring size and told my boyfriend. I don't know how, I never wear rings.