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!