By the time Jon got to school, he was worn out with terror, as he thought about all the possibilities that his new stone could cause. He figured that there was only one way to be sure that the stone couldn't change reality the way he thought it might.
"I wish this stone would disappear forever," he said. The stone glowed and then POOF, it was gone.
He felt relieved. Now, if only I could find some way to get my stone back, Jon thought, not realizing that the stone he just had was his stone.