I considered a princess solitaire on a necklace but when I saw how much more brilliant a round brilliant diamond is (Tiffany’s DBTY) in comparison, I settled for the round. I have a rather large princess solitaire on my engagement ring and it’s perfect. I’ve noticed with the smaller stones (less than 1 ct stone for earrings, necklace, tennis bracelet, etc.) a round brilliant performs much better than any other shape (though I’m impressed with the marquis diamonds in the Victoria collection).