'La Regente', the fifth largest pearl known to exist, is displayed in front of Christie's employee Alexandra Jaffray at the offices of the auction house in central London, Tuesday Oct. 11, 2005. The piece from the French Crown Jewels is estimated to fetch Pounds 300,000 to 480,000 (US $525,905 to 841,502, Euros 436,907 to 699,053) when it comes up for sale in Christie's Geneva's 'Magnificent Jewels' auction on November 16, 2005. The egg-shaped pearl which weighs 302.68 grains, was given by Emperor Napoleon I to his second wife Marie-Louise in 1811, and originally set in a tiara. (AP Photo/Matt Dunham)