I like the bottom one looking from top down, but from the side it looks squatty. The prongs on the middle one look bulky but I like the side profile. Not sure about the top one. I think it would depend on the size of the stone if I'd pick that one. The head looks like one good accidental whack could knock it off.....
Are these your only choices? Have you already bought the stone? Or are these all ready made rings? Honestly, choosing the diamond the most important part. Find a really nice diamond in your budget and then figure out how to set it.
I dislike four claws on a rounds diamond because it makes the stone look square so I’d definitely go with number three. As it’s slightly lower to the finger it would be easier for daily wear.
Out of the choices given, I like number 2. I prefer the look of 4 prongs on a round diamond, but most on here prefer 6. I would ask to make them less bulky. Good luck!
Number 3 for me -
1) The setting is lower which is more comfortable to wear on a daily basis
2) There are 6 prongs which gives the diamond a more rounded look
3) Solid gold band, which lets the main diamond do all the talking!
I think the middle setting is too prongy. The prongs overpower the diamond. Number one or three are both pretty in my opinion. I would pick the one you think she would like most.