how do people guess ring size without blowing it?? 💍😬

i’m planning to propose and really want it to be a surprise, but i have no idea how to get her ring size without straight-up asking 😭 i did try measuring one of her rings in secret, but i feel like i might’ve messed it up... and resizing later kinda kills the vibe? if you pulled off a surprise proposal, how did you figure it out?? any sneaky tips would be much appreciated! #proposalplanning #ringsizehelp #surpriseproposal