The most expensive yacht in the world as of 2025 is the History Supreme, valued at approximately $4.8 billion. This yacht is unique due to its construction featuring 100,000 kilograms of solid gold and platinum, with lavish and rare materials such as a T-Rex bone and meteoric stone embedded in its interior. It reportedly belongs to a Malaysian businessman named Robert Kuok and is noted for extreme luxury and extravagance, although some believe it might be a hoax due to its secretive nature and absence from major ports.

Other very expensive notable yachts include:

• Eclipse, owned by Russian billionaire Roman Abramovich, valued at about $1.5 billion, with advanced security systems, two helipads, swimming pools, and a mini-submarine.

• Azzam, owned by Sheikh Khalifa bin Zayed Al Nahyan (UAE President), valued around $800 million, the world's largest private yacht at 590 feet, known for speed and size.

Thus, History Supreme holds the top spot for expense due to its lavish use of precious metals and custom luxury features.