What about fancy-shaped diamonds like marquise, pear, oval, heart, emerald, princess, radiant, and others? How can a consumer know a fancy-shaped diamond is well cut?
Due to the symmetry of round brilliant-cut diamonds, it is much easier to formulate proportion criteria and strike an optimum balance between brilliance and dispersion. There is currently no universal set of standards constituting ideal proportions for fancy-shapes. With that said, here are some general guidelines: