Borrow a Bill from an audience member. Tear a corner off the bill and hand the rest of the bill to a spectator. Ask her to place it in the open pendant, which is in a beautiful display case and close the pendant Remove the pendant from the display case and have a spectator hold it The corner of the bill can be burned or vanished.
Now a spectator sitting in the third seat of the third row or any place you desire will be asked to reach under his seat and remove a taped envelope. He is invited on stage with the envelope. Without the magician touching the envelope, the spectator is asked to open it and remove its contents. He will produce a twenty dollar bill with a corner missing. The girl will be asked to open the pendant. Inside she will find the matching corner.
There are hundreds of other routines that can be performed with this device.