I have a goal to purchase a 3ct radiant diamond. I am able to find numerous sites that offer specifictions for ideal to very fine cut diamonds, but I''m not sure if a radiant cut diamond should be square or rectangle. One site described a radiant cut as a "emerald" with facets another sites compares a radiant to a princess... so my question is .. should a radiant be square or rectangle or is it a matter of preference?? Thanks!!!