I kind of doubt man-made diamonds have the “fire” or intensity and variation of color of natural diamonds. But I could be wrong. All diamonds are not created equal, that’s why they are graded. Maybe man-made diamonds would look better than some natural diamonds. They should have better clarity, for example than many diamonds. But judging from artificial rubies and other precious stones I’ve seen and artificially colored stones I’ve seen I would prefer the real thing from an aesthetic point of view, even if it wasn’t perfect in all respects.