The magician shows 2 transparent tumblers. A spectator examines them, and he visibly fills them with milk, coke, orange juice or any opaque liquid. A ring is borrowed from a spectator. The magician does not even need to touch it.
The ring is taken from the spectator on a small hook and lowered into one of the glasses. The magician's hands are shown to be clearly empty.
The magician now takes up the second glass of liquid, from which he takes out the actual borrowed ring with the help of the hook.
Everything can be examined by the spectator before and after.
Your hands never touch the ring!
No palming, no gimmicked glasses, no magnets, no threads, no duplicate ring. And once again -- your hands never touch the ring!