DiamondBuzz
Napoleon’s diamond brooch sells for $4.4m at Sotheby’s Geneva
A diamond brooch taken from Napoleon Bonaparte following his defeat by Prussian forces in 1815 has fetched $4.4 million at Sotheby’s Geneva—exceeding its highest pre-sale estimate by more than seventeen times.The piece, which converts into a pendant, showcases a 13.04-carat oval diamond encircled by nearly 100 old mine-cut diamonds set in two rings. Initial estimates had valued it between $150,000 and $250,000.
According to Sotheby’s, Napoleon was forced to leave behind several carriages, including one carrying valuable possessions, when they became mired in mud several miles from the Waterloo battlefield as he rushed to escape the combined British and Prussian forces that had defeated his army.
The brooch was given to Prussian King Friedrich Wilhelm III three days after the battle as a war trophy. It stayed within the Hohenzollern dynasty for generations, passing through various German emperors, before entering a different private collection in recent years.
Another Napoleonic treasure, a 132.66-ct green beryl which he is reported to have worn on his coronation mantle in 1804, was bought for $1m by a US museum – also for 17 times its high estimate.Both items were highlights of the Royal and Noble Sale, which raised a total of $14.3m.
In a clear sign of the growing strategic importance of lab-grown diamonds for technological applications, the Spanish government has committed a massive EUR 750 million (approximately $813 million) investment to Diamond Foundry’s new manufacturing plant in Trujillo.
This significant funding injection is specifically earmarked for the production of semiconductor-grade, lab-grown diamonds. It dramatically boosts the project’s war chest, adding to the initial EUR 80 million in funding that the European Union had already pledged last December.
The Trujillo facility is poised to become the largest of its kind in Europe, specializing in high-tech, industrial, and semiconductor-grade diamonds.
- Projected Output: When operations begin—anticipated sometime between 2027 and 2029—the plant is expected to yield over 4 million carats annually, with production slated for substantial increases thereafter.
- Total Project Value: The full cost of the Trujillo project is reported to be a staggering EUR 2.35 billion.
This monumental investment underscores a key trend in the lab-grown diamond sector: a heavy pivot away from the jewelry market and toward high-value industrial and technological applications.
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