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World’s Largest Black Diamond Sells for Over $4 Million

A picture taken on January 17, 2022 shows The Enigma, a 555.55 carat black diamond, at Sotheby's in Dubai, UAE. (AFP)
A picture taken on January 17, 2022 shows The Enigma, a 555.55 carat black diamond, at Sotheby's in Dubai, UAE. (AFP)
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World’s Largest Black Diamond Sells for Over $4 Million

A picture taken on January 17, 2022 shows The Enigma, a 555.55 carat black diamond, at Sotheby's in Dubai, UAE. (AFP)
A picture taken on January 17, 2022 shows The Enigma, a 555.55 carat black diamond, at Sotheby's in Dubai, UAE. (AFP)

The rare black diamond known as ‘Enigma’ went under the hammer in London for £3.16 million ($4.3 million). According to Agence France Press (AFP), it’s believed to be the world's largest cut diamond.

The 555.55 carat, 55-faced diamond was sold at an online auction that concluded on Wednesday. The stone is registered as the largest natural diamond in the world as of 2004 by diamond experts GIA and Gubelin, and the largest cut diamond in the world as of 2006 by the Guinness World Record book.

Unlike classic diamonds that are usually unearthed from deep undergrounds, black diamonds are often close to or on the Earth’s surface, which may possibly suggest extraterrestrial origins, stated Sotheby’s auction house.

“It is thought that this specific type of black diamond was created either from meteoric impacts producing natural chemical vapor deposition or an extraterrestrial origin - from supernovae explosions that formed diamond-bearing asteroids which ultimately collided with the Earth,” added Sotheby’s statement.

Today, these diamonds are found exclusively in Brazil or the Central African Republic. Their aggregated structure is the toughest in existence, making them nearly impossible to cut and polish. Enigma was bought in the late 1990s and would have weighed over 800 carats in the rough form. It took over three years to produce this uniquely shaped faceted specimen.

Its shape is inspired by the Middle Eastern palm symbol, a sign of protection and a tool of deflection against the evil eye. However, the highest price of an auctioned diamond remains with the Pink Star diamond, which was sold for $ 71.2 million at a 2017 auction also organized by Sotheby’s, in Hong Kong.

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King Charles’ Annual Swan Census Begins on the River Thames

Swan uppers travel along the River Thames between Staines and Eton, during the ancient tradition of Swan Upping, the annual census of the mute swan population on the River Thames in London, Monday, July 14, 2025. (AP Photo/Thomas Krych)
Swan uppers travel along the River Thames between Staines and Eton, during the ancient tradition of Swan Upping, the annual census of the mute swan population on the River Thames in London, Monday, July 14, 2025. (AP Photo/Thomas Krych)
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King Charles’ Annual Swan Census Begins on the River Thames

Swan uppers travel along the River Thames between Staines and Eton, during the ancient tradition of Swan Upping, the annual census of the mute swan population on the River Thames in London, Monday, July 14, 2025. (AP Photo/Thomas Krych)
Swan uppers travel along the River Thames between Staines and Eton, during the ancient tradition of Swan Upping, the annual census of the mute swan population on the River Thames in London, Monday, July 14, 2025. (AP Photo/Thomas Krych)

Scarlet uniforms flashed against the riverbank. Wooden skiffs glided in formation. A young swan, gently lifted from the water, was measured, inspected and released.

The annual five-day census of swans belonging to King Charles III– known as Swan Upping -- began Monday on the River Thames to assess their health.

One of the British monarch’s less-known titles is Seigneur of the Swans — Lord of the Swans — and according to ancient lore, he or she owns all members of the mute swan species found in Britain’s open waters.

AP reported on Tuesday that every year, a team of carefully selected oarsmen — Swan Uppers -- are tasked with finding the swans on a stretch of the Thames.

When a family is spotted, they shout, “All up!” and the boats quickly surround the birds, marking them and checking for signs of disease or injury.

“It gives us an indication of what’s going on throughout the country,” said David Barber, who wears a scarlet jacket and a white swan feather in his cap and bears the title of King’s Swan Marker. “It’s a tradition, but I think it’s serving a very useful purpose as well.”

Barber has been leading the event for more than 30 years.

He is accompanied by a vet and oarsmen dressed in three colors: red for the king, white for the Worshipful Company of Vintners and blue stripes for the Worshipful Company of Dyers.

The last two are medieval London trade guilds that were granted ownership of some Thames swans in the 15th century.

The census tradition dates to the 12th century, when swans were considered an important food for royal banquets and feasts.

While swans are now legally protected from hunting, they face threats from disease, pollution, vandalism and cruelty, Barber said.

Their numbers have declined over the last two years, primarily due to outbreaks of avian flu across Britain, he said, adding that only 86 young swans were found during last year’s Swan Upping, which was 45% fewer than the year before that.

But Barber appeared positive at the end of the event’s first day, with a total of 16 young swans recorded.

The census continues until Friday, traveling from Sunbury, on the outskirts of London, to Abingdon, 80 miles (130 kilometers) upstream.