The shank on the Caroline is 2.3mm. I have the Caroline but I had them make the pave diamond part plain. (See pictures). I don't know what size shank the U-100 has, but you'll notice that the band is a little more squared off, whereas it's smoother on the Caroline and has a very subtle knife-edge.
I got my diamond from WF and they worked with Vatche to make the custom Caroline band and now they're making my wedding band to go with it. I'd highly recommend working with them.
Here's a link to a page with a 0.83 ct, which is smaller than the one you are looking at but will give you an idea as to how the ring looks with smaller stones.