i think that it might be a single emerald cut diamond maybe a princess cut not to gaudy though like small but still gorgeous. or  possibly cushion cut or maybe radiant i don't no but i no that it's beautiful what do you think??

Bella’s ring would have to be just a bit Gothic or at least very medieval or antique in setting, and the diamond would have to be rare.   Since the vampires have been around forever, the setting would have to look like a work of art that was museum-quality in its style and configuration.  The diamond would have to have a hint of “pink” in it, because of the vampire element, and yet, nothing blood red or over the top, because Bella would never want that, and its too obvious a choice for a person who is going to have a very long time to look at it.  The picture that I would choose is this lovely hint of pink diamond ring: http://www.google.com/imgres?imgurl=http://www.tdcjewelry.com/images/custom/originale.jpg&imgrefurl=http://www.tdcjewelry.com/custom/&h=116&w=116&sz=14&tbnid=-bcJ7mKqVIoJ:&tbnh=116&tbnw=116&prev=/images%3Fq%3Dpink%2Bdiamond%2Bring&sa=X&oi=image_result&resnum=1&ct=image&cd=1.