The stone he put in its place looked almost exactly like Jon's stone, except that it wasn't. It was The Clique Stone.
It worked just like the normal stone, except that when someone made a wish with it, the wisher would become part of another randomly-picked "social group". So if a prep made a wish, he or she could become a geek, a nerd, a goth, a "normal" or "average" person (like Jon and his friends), or any other specific group that someone would be a part of.
The wisher would be aware of the change, but anyone who didn't hear the wish wouldn't. To them, the wisher's new lifestyle would seem completely normal, since their memories would have changed to match the new reality.
