Magician borrows a wedding ring and drops it in a small purse, then the middle of a chain is placed in the purse with the ends of the chain sticking out at all times. The chain is pulled out of the purse and handed to the spectator with the linked on ring allowing her to take it off herself.
The chains used for this trick is not magnetized furthermore it is not prepared at all. This trick can be learned quite quickly as it does not require any special sleight of hand.
Comes complete with instructional video and props.