The star crystal is a Swarovski crystal.
It is a strange crystal that Crystal Aurora.
Since the upper one is a hook (clasp), you can remove it and use it as a charm. For example, (Fastener in general, Back charm, Mobile game, Wallet, Pen holder, Digital camera case) etc.
Metal = brass, other.
Weight: about 0.007pounds, Star crystal : about 0.4724inches.Made in Japan.
Kisaragi Cell Phone Strap 043 Star- Crystal Aurora B081JZ17DL