marialc121, you have really good taste in rings! All three of these options are really pretty. That said, the third is my favorite; so here is my slightly biased opinion of each:
The first one is elegant and classic. It appears to be an exact match to your wedding set, while showcasing a flawless example of metal mixing.
The second one is an eye-catcher. When I first saw the photo I thought that you had put three rings together to make a five ring stack. After reanalyzing I concluded that it is probably just one ring. With most designs, I would probably think that the width of the second option is too wide in comparison to your wedding set; however, since it can appear to be three ring, I think it looks like an eye-catching ring stack. While this is my least favorite of the three, it is still quite beautiful.
The third one is an example of perfection! (Ok, I warned you that I was biased.) I like the fact that the pink gold band is wider than the white metal bands since there are two of the white metal bands and only one of the pink gold. I also really like the look of these two different diamond settings together. The third is a unique ring stack that blends together perfectly. Another flawless example of metal (and diamond setting) mixing.
All three examples are gorgeous! Which one looks and feels the best to you?