It's a sort of communication device - you can use it to send messages to all the other people stuck here. Only works inside the house, though.

[ apparently, it usually has more functions, but he'll be damned if he knows anything about that - the short explanation is enough to cover everything it does here. He takes a step back, inclining his head slightly in a "lead the way" gesture. ]

And you do stand out. I didn't think I'd ever get to see a second gem. [ a beat - he's looking at their hair and trying to make a guess on what jewel they are. It would be easier if he could hold them up to the light like a regular gem, but!! ] Lapis lazuli?

[ uh oh ]