Not even a chair frame, but likely a wire frame, probably covered in foil and then crystals. That’s a common method for art pieces. This wasn’t a chair covered in crystals, but a ‘delicate internal structure’ in a chair shape.

e: that’s probably also why it was fairly easy to fix: re-bend the wire, then replace any crystals that fell of. This idiot is lucky he didn’t get a stabilising rod up his proverbial.