Most magic moments don’t last long.
BUT the impossible moment in DIAMONDS ARE FOREVER lasts FOREVER. It leaves your spectators with an incredible object that they can keep for the rest of their lives.
DIAMONDS ARE FOREVER uses two cards: A red ace, and a black two. You show the backs and faces of the cards, and then you put the two in your spectator’s hand. Then you MAGICALLY PEEL THE DIAMOND OFF THE RED ACE, and MAGICIALLY BOND THE RED PIP ONTO THE MIDDLE OF THE BLACK TWO. The spectator gets to keep both cards.
She can look at them for hours, but she’s not going to find anything.