Personal information belonging to 400,000 wealthy clients, including Premier League stars, may have been stolen in a cyberattack targeting a high-end diamond dealer, according to The Sun.

Hackers claim to have obtained home addresses and information about ring purchases from hundreds of thousands of high-net-worth individuals after launching a cyberattack on a Mayfair jeweler.

The Metropolitan Police's Cyber Crime Unit has launched an investigation into the potential breach at 77 Diamonds, a company known for serving top footballers and TV personalities.

Elite athletes are key clients of this London luxury jeweler, where they commission bespoke engagement and wedding rings.

The stolen data reportedly includes the home addresses and billing information of high-profile buyers, as well as the exact valuations of their purchased diamond rings.

The hackers have reportedly put this confidential database up for auction on the dark web, significantly increasing the security risk for the company's elite clientele.

This Mayfair jeweler specializes in custom-made jewelry, with individual pieces ranging in price from a few thousand pounds to over £1 million.

In-house expert craftsmen and apprentices create around 10 intricate custom pieces for high-end clients every day.

Following the incident, the company immediately hired external cybersecurity consultants to investigate the full extent of the breach.

High-profile clients, including top football stars, have also been advised to enhance their personal security measures during the investigation.

The matter has been reported to the UK Information Commissioner's Office, and experts are working to trace the source of the cyber intrusion.

Tobias Kormind, Managing Director of 77 Diamonds, sent urgent email warnings to customers who had purchased jewelry from the company over the past 11 years.

Kormind told The Times: "We are investigating the potential for unauthorized access and misuse of our customer database and have taken immediate steps to secure our systems."

The executive confirmed that the stolen data may include names, email addresses, physical mailing addresses, and complete purchase histories.

He told affected clients: "At this stage, we cannot confirm whether your personal information has been specifically accessed."

"We are contacting you now so that you can take appropriate precautionary measures while the investigation continues."

Despite the potential compromise of high-value customer records, the company confirmed that customer banking information is not stored on the compromised servers.

Kormind also confirmed that, to date, no clients have reported being directly targeted or harassed by extortionists following the data breach.

Internal cybersecurity experts analyzing a portion of the leaked data noted that residential addresses were not included in the sample test batches reviewed.

However, the police investigation and internal forensic assessment are still ongoing, with experts working to verify the full scope of the breach.

Officers from the dedicated cybercrime unit are also continuously monitoring dark web markets for signs of the stolen data being traded.

This high-profile hacking incident occurs against a backdrop of rapidly rising digital crime affecting UK businesses.

The UK Department for Science, Innovation and Technology's "Cyber Security Breaches Survey" shows that 43% of UK businesses experienced a cyberattack within a 12-month period.

Independent estimates by the UK government indicate that digital crime activities now cost the UK economy approximately £14.7 billion annually.

Security officials warn that cyber threats originate from both state-backed organizations and organized criminal groups operating for profit.

External threat actors supported by countries such as Russia, Iran, and North Korea are actively targeting UK infrastructure and commercial entities.

Among the criminal groups operating for profit is the Russian hacking organization Conti. Leaked internal records show that its operations function much like a traditional company, with a management structure, departmental budgets, and HR teams.

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