The Arco Valley Pearl is a white 575 carat natural blister baroquepearl with pink and yellow overtones. It measures 79 x 41 x 34 mm. Chinese emperor Khubilai Khan reportedly gave it to Marco Polo.
During 2007, an UAE collectionner said he bought the pearl from a french owner for 8M US$ but in fact it's still owned by an european company (august 2008). It's the biggest natural pearl outside a museum and the second biggest ever.