The jewel is now on display in Paris and will move on to London and Zurich before it gets auctioned off in Geneva on May 14.
"It has a fascinating history, and really is a once-in-a-lifetime sale," said David Bennett, Sotheby's jewelry chairman. "When it was made in the 16th century, the pear cut was new, bold, and so it became the most sought-after jewel of its era. Before the 'Beau Sancy' all diamonds were rudimentary."
Such was the diamond's fame that in 1604, French King Henri IV purchased it from the first owner, the Lord of Sancy, as a gift for his glamorous wife, Marie de Medici, one of Europe's richest women.
Sent from my iPhone