Sorry to bust your bubble, but from the pictures, I can guarantie you that
1) it is not a meteorite (they are hard as hell, and do not contain carbon).
2) it is not diamonds (not found in coal).
Doesn't mean what you have found is without value, but just don't get your hope up too high.
Try to get hold of a piece of quartz and see if it scratches that. If it doesn't, then that is probably what it is (quartz - Si02).