I'm sorry I can't help and this probably isn't much use either but there's a thread running at the moment with a trilogy of princesses total of 1ctw. The central stone may be around the .55ct mark. Here:
this isnt what you asked for, i realise, but it''s the best i could come up with. here''s a half ct princess cut ring not on a hand, and a photo of a 1/4 ct princess on a hand. keep in mind - the 1/4 ct stone is next to a 5mm wedding ring. first, the half carat ring....