I like the faux shopping idea but she may tell you what she likes for YOU and not for herself. You'll have to make sure she is thinking of herself when pointing out rings she likes
Yes: tread carefully with fake shopping. I have been a victim and duped by my niece for my sis for a Christmas present or two.
I was trying to pick out something 'cool/trendy' for my.niece and ended up with ..well. what's cool and trendy for teens isn't very cool and trendy for me lol.
I agree with morning glory. She's loved and appreciated her honker (love it) for all these years, I'm sure she'll love what he chooses whether she would have picked something like it or not.
We love all things sparkle, and as clueless as our men may be, they do have somewhat of an idea as to what suits us.
Besides, you don't want to be to blamed for picking the wrong setting. Let it be his fault, just make sure he doesn't cut off the tag lol!