True, but you can meet in the middle re: this kind of thing with the ring. Having established that it’s going to happen at some point, take a trip to a jewelers ‘for fun’. Pay attention to what she goes ‘oooh’ over - style, stone, cut, etc. Write this information down to search separately.
It’s a bit of a stereotype I suppose, but trust that your future wife knows what she’s doing on that visit (particularly if y’all don’t browse jewelry together frequently - it’s kind of an anvil of a hint). This way there’s still an element of surprise, but you’re not just picking something random in hopes it pleases.