What if you can vanish a borrowed ring, without ever touching it or even going near the spectator?
Imagine this, your spectator takes the ring off her own finger, she puts the ring into the box herself, touches it to make sure that everything is real, and closes the box. And that's it. She opens the ring box again, and the ring is already gone. Wherever and however you make her ring reappear, is up to your own imagination.