Rare Napoleon’s Diamond Brooch Up for Auction at Sotheby’s

Historic French jewels are having quite a month! It was just announced that a stunning brooch featuring old mine-cut diamonds, once owned by Napoleon Bonaparte will be offered for the first time at auction for an estimated $150,000 to $250,000, according to Sotheby’s.

Measuring approximately 45 millimeters across, the circular diamond brooch features a magnificent 13.04-carat oval diamond at its center, encircled by nearly one hundred glittering old mine-cut diamonds. The rare jewel will take center stage at the auction house’s prestigious annual Royal & Noble Sale.

French jewels have been in the spotlight lately, with headlines dominated by last week’s daring heist of priceless diamond treasures from the Louvre’s Galerie d’Apollon. In brighter news, attention now turns to a spectacular piece with a storied past—Napoleon’s diamond brooch.

Ahead, discover the remarkable history behind Napoleon’s diamond brooch.

Napoleon’s Diamond Brooch: A Lost Treasure

Created in 1810, this remarkable brooch was originally designed for courtly occasions during the height of Napoleon’s reign. Its story, however, took a dramatic turn in 1815, when Napoleon was forced into a crushing defeat at the Battle of Waterloo. As the French Emperor fled the battlefield, the jewel was seized by the advancing Prussian army—a glittering spoil of war that symbolized the end of his imperial ambitions.

Now resurfacing in the public eye, Napoleon’s diamond brooch will headline Sotheby’s prestigious Royal & Noble Sale. It carries with it the memory of Waterloo, a battle that redrew the map of Europe and brought Napoleon’s reign to a definitive close.

Napoleon’s Diamond Brooch Was Seized by the Prussians After Waterloo

The brooch was just one of a few of Napoleon’s personal effects stolen by the Prussians.

They managed to seize medals, weapons, silverware, a hat, as well as a jewelry box filled with loose diamonds and other jewels. In the chaos of his army’s defeat and his hurried flight, Napoleon abandoned several carriages stuck in the muddy roads, including the one holding these exquisite items.

The abandoned treasures were soon offered to Prussian King Friedrich Wilhelm as battle trophies following the French defeat at Waterloo. Once in the king’s possession, the brooch entered the Prussian royal collections, where it is believed to have remained for much of the 19th century. Napoleon’s diamond brooch remained in the House of Hohenzollern for centuries, passing from King Friedrich Wilhelm III to successive German emperors before eventually moving to a private collection.

The Historical Importance Behind Napoleon’s Diamond Brooch

Napoleon’s diamond brooch is more than just a glamorous piece of jewelry—it carries profound historical weight.

The 13.04-carat oval diamond at its heart is not merely a dazzling stone, but a symbol of imperial grandeur, created to embody the authority and magnificence of the world’s most famous Emperor. Its capture by the Prussian army after Napoleon’s crushing defeat at Waterloo transformed the jewel into something more than an ornament: it became a tangible marker of a seismic shift in European power. In a single moment, the glittering symbol of an empire was turned into a trophy of conquest.

That brooch has, quite literally, borne witness to the rise and fall of Napoleon—a man whose military genius and political ambition reshaped the continent. Like the storied French Crown Jewels, it encapsulates a legacy of opulence, power, and intrigue. But beyond that, it reminds us of jewelry’s ability to embody history itself, serving as a direct and enduring link to one of the most influential figures the modern world has ever known.

Other Jewels Included in the Royal & Noble Sale

Two standout lots in the auction also highlight the Old World aristocracy. One is a natural pearl and diamond hair ornament that once belonged to Cunegonde of Saxony, a duchess of royal lineage whose jewels reflected the refinement and grandeur of 18th-century European courts. It combines luminous natural pearls with diamonds and carries an estimate of $340,000–$500,000.

The other is a rare 13-carat light pink diamond ring from Princess Neslishah Sultan, one of the last Ottoman princesses and a direct descendant of both the Ottoman sultans and Egypt’s last khedive. Known for her elegance and for bridging two fading empires, Neslishah’s jewels are coveted pieces of royal heritage. This exceptional ring, valued at $240,000–$400,000, represents not only remarkable gemological rarity but also the final chapter of a dynasty that once ruled vast parts of Europe, Asia, and Africa.

Viewing and Auction Details for Napoleon’s Diamond Brooch

The auction for Napoleon’s diamond brooch is the most authoritative and anticipated of its kind on the global auction calendar, and will take place at the Mandarin Oriental in Geneva on November 12.

Bidding opens online on October 24 at Sotheby’s.