Vivid blue diamond could sell for $50 million at Christie's auction

Christie's will auction off the largest internally flawless fancy vivid blue diamond, called "Bleu Royal," on November 7th in Geneva. The diamond, set in a ring, could sell for up to $50 million. In a separate online auction, Christie's will also offer a pearl necklace worn by Audrey Hepburn in the movie "Roman Holiday" and a Rolex wristwatch worn by Marlon Brando in "Apocalypse Now." The watch, engraved with Brando's signature, is valued at 1 to 2 million Swiss francs.