The employee next to the announcer removed the sheet covering the next prize, and reveal it to be an empty clam shell, encrusted with purple diamonds as it was standing on the column. You didn't see where the pearl was, but the diamonds covered both the inside, and the outside of the shell.
"This Amethyst Clam Shell was found in 1751, by pirates when they were crossing the Caribbean border to South America, to hunt for what else, gold doubloons, and other sorts of treasures they wanted," the announcer explains. "They were later captured by the Spanish Navy, and sent to a Jamaican prison, while the clam was sent to North America, during the Boston Massacre, and recovered by us. We shall start the bidding at $1000.00. Do I have anyone bidding?"