The person who grabbed for the stone was Jon's Goth sister Zoe.
Zoe was into the occult, so she immediately recognized it. It was a magic stone. And if she was thinking of the right one, a wishing stone.
She wasn't sure how it got in her room, but she was glad it was. Having the ability to wish for anything was something that Zoe truely desired.
She smiled when she thought of something. "I wish ..." she said, not realizing that her wish would be granted to Jon, instead of her.
