Those are really pretty ideas. I am partial to the last design by CVB.
Did you know who you wanted to have make the setting?
The setting that has the small inner halo of pink diamonds that surround the center might help the color pop even more, especially if you do a cup in addition!
You could also do just a bezel, with a really rosy gold, or you could do an outside bezel with a very narrow lip and an inside then halo of pink melee.
pretty stone!
You’ve got a wide range of finger coverage in your setting inspo pics.
if you can provide a hand shot with the stone propped between your fingers - I can do a quick cut and paste of what to expect scale wise with a few of them? Maybe that might help you narrow down what speaks to you?
I second rose gold cup and pink diamond halo as @elizat suggested. Have a tiny light pink diamond set like that and the combination does help make the pink diamond look bigger.
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They are not vintage style but I think if you find a design you like you can add vintage touches like milgrain, etc.