Beausancy diamond 240412

Appears In:

400-year-old 'Beau Sancy' diamond to be auctioned off for an estimated $4 million

The Beau Sancy diamond has a long royal history, and was one of the most prized stones in the Prussian Empire.

A picture taken on April 23, 2012 at the Sotheby's auction house, shows the famous diamond "Le Beau Sancy" which adorned the Marie de Medici's crown during her coronation at the head of the French kingdom in 1610. The diamond is valued between 2 and 4 million dollars and will be exhibited in different countries before being auctioned in Geneva on May 15, 2012.

Francois Guillot

AFP/Getty Images