A half bezel at WF comes in two-tone by default. Perhaps I would tinker a bit with the sides of the crown, but basically this would be just about right.
A girdle setting like the Lucida Bezel would be even nicer ! I do not have a pictue of that for a princess. DiamondsBuLauren makes a three-stone version (perhaps a solitaire is nerby as well... if you like the idea)