It doesn't have to be in the stone itself, but rather the wooden portion of the pendant.

[Misora contemplates quietly for a moment, then crosses her arms.]

But given the ... facilities here, I guess it's hard to imagine how they would have acquired that kind of modern technology in the first place.

[Not that anything really seems to be obeying any logical order.]

But then again, I'd be lying if I said that I'd taken more than a cursory look around the courtyard and the main hall thus far.