The Louvre, the world's most iconic museum, remained closed Monday after thieves stole priceless treasures from the Apollon Gallery, the home of the French crown jewels. In a daring daytime heist Sunday, the thieves made off with eight pieces, but dropped one as they made their escape.

Here's what the robbers got away with:

Empress Eugénie's tiara

Zhang Weiguo/VCG via Getty Images

The Pearl and Diamond Tiara was commissioned by Emperor Napoleon III to celebrate his marriage to Eugénie de Montijo in 1853, according to Tatler. The piece features 212 pearls and nearly 2,000 diamonds.

Grand Corsage Bow brooch from Empress Eugénie

Jb Reed/Bloomberg via Getty Images

The brooch seen above was originally the center of a belt made up of more than 4,000 stones belonging to the Crown D

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