Last one! (Primrose)
I think it's the most timeless
it's slightly Victorian looking which I absolutely adore.
The third one would be my personal second choice.
The second one is very modern - not so much timeless in my opinion. Kinda modern / Art Deco ? I feel it can be a little dated down the line. My parents wedding rings are very square and geometrical - although unique it's not very traditional - but that's because my father designed the rings himself. But once again - up to your personal preference.
The first one - idk how the contrast will hold up in terms of "style" since everything is colour blocked now a days.
Personally id go for a full solid colour diamond one unless you already got one then maybe get the first one as a contrasting piece in your collection.