Cameras just don't capture true color, so it is impossible to tell even if the setting is real or not from the picture, I was going on the pits, and scratches which suggests that it is soft.
And again, it is IMPOSSIBLE to tell if the stone is real or not from a picture, as far as how many prongs, that has nothing to do with nothing.
Admittedly the possibility of it not being real is a lot greater than it being real, but only someone who really knows, will know in person. It's easy to call it junk, and those that have have a good chance of being right, but when you do get it checked take along your camera, and ask the guy if it is possible to tell from the picture.