A model looks at one of the world's most magnificent natural pearl at a Christie's preview in Hong Kong Saturday, Oct. 22, 2005. The historical pearl from the French Crown Jewels is the fifth largest pearl known to exist (estimate US$500,000-800,000). The pearl was given by Emperor Napoleon I (1769-1821) to his second wife Marie-Louise in 1811, and originally set in a tiara. The pearl will be sale in an auction in Geneva Nov. 16. (AP Photo/Kin Cheung)