Talk to a jeweler in advance, then bring the significant other in to do some casual jewelry window shopping.
Jewelers get this request often, and most love to be in on a mini-heist.
Your jeweler can discreetly steer the interaction to get their ring size and either announce it in front of you, or just jot it down for you to pick up later.
Even if you get caught, it’s just flattering to your significant other that you went to the trouble.
Actual tip that was passed to me:
Talk to a jeweler in advance, then bring the significant other in to do some casual jewelry window shopping.
Jewelers get this request often, and most love to be in on a mini-heist.
Your jeweler can discreetly steer the interaction to get their ring size and either announce it in front of you, or just jot it down for you to pick up later.
Even if you get caught, it’s just flattering to your significant other that you went to the trouble.