A diamond brooch that French emperor Napoleon lost while fleeing from the Battle of Waterloo in the early 19th century sold for more than 3.5 million Swiss francs (about $4.4 million) at a Geneva auction on Wednesday, Sotheby's said.

The brooch, which can also be worn as a pendant, features an oval diamond weighing over 13 carats surrounded by smaller cut diamonds. The sale price vastly outstripped the high end of the pre-sale estimate of 200,000 francs.

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The hammer price was 2.85 million francs, excluding fees and other charges that were included in the final aggregate price.

The circular jewel was found in a stash of Napoleon's personal belongings in carriages that got held up on muddy roads as he and his troops f

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