I'm sure you'll change your tune if your gem's power is remotely physical; it's going to be difficult to do much with it if it's coverd otherwise.

Beyond that, [she waves a hand,] I'll just assume you're some sort of alien in your own world then...here, at least, everyone with a gemstone is more or less a projection of that self. Make sure not to damage it... [she adds, a rather serious edge coming to those words.]