What is the most expensive item in the world?

Determining the "most expensive item in the world" can be quite challenging because the value of items can vary based on context, rarity, historical significance, and numerous other factors. However, among some of the contenders for the title of the most expensive item are works of art, yachts, real estate, and precious gems. For example, the painting "Salvator Mundi" by Leonardo da Vinci was sold for $450.3 million in 2017, making it the most expensive painting ever sold at auction.

Another example of an extremely valuable item is the History Supreme yacht, which is reportedly worth around $4.5 billion. This yacht is said to be plated with 100,000 kg of gold and platinum and has other extravagances such as statues made of real dinosaur bones.

There are also valuable gems like the Hope Diamond and priceless artifacts like the Crown Jewels of the United Kingdom, which are both incredibly valuable but don't have an exact price tag due to their historical and cultural significance.

It's important to note that "expensive" can also depend on the category of items we are talking about. For instance, Antilia, the private residence of Mukesh Ambani located in Mumbai, is considered the world's most expensive home. In the category of domain names, "CarInsurance.com" was sold for $49.7 million, making it one of the most expensive domain names ever sold.

Ultimately, the title of the most expensive item may change with new discoveries, creations, or sales.