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.



From Homeless to Tour Guide: Londoners Lead the Way Round the Streets They Know Best 

Unseen Tours guide Stefan Gordon, leads a tour around Canary Wharf's West India Quay in London, Britain, June 10, 2025. (Reuters)
Unseen Tours guide Stefan Gordon, leads a tour around Canary Wharf's West India Quay in London, Britain, June 10, 2025. (Reuters)
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From Homeless to Tour Guide: Londoners Lead the Way Round the Streets They Know Best 

Unseen Tours guide Stefan Gordon, leads a tour around Canary Wharf's West India Quay in London, Britain, June 10, 2025. (Reuters)
Unseen Tours guide Stefan Gordon, leads a tour around Canary Wharf's West India Quay in London, Britain, June 10, 2025. (Reuters)

Stefan Gordon spent three years in a homeless shelter in London after a family rift left him without a roof over his head. Now he is using his past experience to tell the often hidden story of one of the capital's wealthiest areas.

Gordon, 31, is one of several formerly homeless people trained by Unseen Tours to lead guided walks in different London neighborhoods. The charity's aim is to reduce the stigma around homelessness and value people's potential.

"My view of homelessness is a person without a home... (but) just because they don't have a home, we can still do stuff," Gordon told Reuters as he led a group tour of Canary Wharf and West India Quay in east London.

In the 18th and 19th centuries the area, now the capital's business hub, was home to a large dock complex built to receive products such as sugar from the Caribbean, where enslaved people were forced to work on plantations.

The docks were created by and for merchants, but many of those who worked there were often badly paid and lived in poor conditions, something Gordon says he can relate to.

"Lots of people used to sleep in lodging houses and the hostel where I slept was an emergency lodging house so I kind of related a lot to that," Gordon said. "It was very, very tough back then... It's still tough now."

Gordon, who has autism, is now living with his mother and has been a guide since February. He gets paid 60% of the value of each tour ticket while the remainder is reinvested into Unseen Tours to cover operating costs and train new guides.

Unseen Tours' director of communication, Charlotte Cassedanne, said the guides, with help from the organization, research and design their own tours, and can incorporate their personal stories into their walks if they wish to do so.

They have been running for more than a decade, and 30,000 visitors have taken part in their tours. With six guides trained so far, Unseen Tours is currently fundraising to train three more.

"When you experience homelessness, you become sort of less than human... People ignore you daily... Putting them at the center of the storytelling really helps them have agency again," Cassedanne said.