Legend holds that the marquise shape was created at the behest of Louis XIV. He wanted a diamond shaped to match the smile of the Marquise of Pompadour. And so, the king's cutters delivered a diamond that to-date gives the greatest illusion of any diamond shape known. Due to symmetry and the naked eye, the marquise diamond shape actually appears to be quite bigger than it is. Surround the stone with diamonds and the sheer size of the ring could cut a slice of birthday cake.