I agree with Mrs. W...I think you can do better. What are your specs and budget? Are you looking for a modern style cushion or an antique style cushion (i.e. larger facets)?
The white areas on are on the sides which is going to make the stone appear more elongated than it is (thinner) in some lights. If you are going to halo it you might be fine as that will help to define its shape but I can see why some are skeptical.