Most Expensive Diamonds in the World: Every Record-Breaking Stone Ranked

Some diamonds are just diamonds. And then there are the ones that rewrote history, sparked wars, changed hands between emperors, and sold for prices that broke the internet.

The global diamond market sits at $106.7 billion as of April 2026, per Persistence Market Research. But the stones in this guide exist at a completely different level. These are the ones serious collectors obsess over, auction houses build entire events around, and governments have filed legal battles to reclaim.

If you are here to learn about the huge price tags or discover the most expensive diamond ever sold, this guide covers every stone worth knowing about.

The answer to which diamond is the most valuable depends on different factors and how the value is measured. The CTF pink star holds the highest net sale price auction record of all time. 

The Williamson Pink Star has the highest per-carat price record. If you consider current estimates, then the Koh-i-noor and Cullinan diamonds of the British Crown Jewels are worth far more. But they were never sold and will never be. Both Koh-i-noor and Cullinan are considered the most expensive diamond jewelry and priceless but they were never sold, only acquired.

Here are some rare diamond names you will find fascinating.

The Koh-i-Noor diamond was found at the Kollur mine in India. It weighed 191 carats at the time of its discovery. Few diamonds in recorded history have traveled as far or changed hands as many times as this stone did. But Koh-i-noor is still believed to be the most expensive diamond in the world.

It passed through the Mughal Empire first. Then Persian rulers took it. After them came Afghan emperors, and then the Sikh maharajas. The transfers were rarely peaceful. Following the Second Anglo-Sikh War, the British East India Company obtained the diamond and presented it to Queen Victoria.

Four countries have formally asked for it back. India, Pakistan, Iran, and Afghanistan have each submitted ownership claims at different points. The British government has not accepted any of them. The stone is considered the most valuable diamond in the world. It was classified as a national treasure and cannot be sold or transferred under current law.

In 1905, workers at a mine in South Africa uncovered a diamond that had never been seen before in terms of size. It was the largest diamond ever found at that point. The Transvaal government purchased it two years later and sent it to King Edward the Seventh as a gift.

A team of experts was brought in to cut the stone. The process took months of planning. In the end, they divided it into nine major pieces. The largest piece was placed into a royal sceptre. The second largest was set into a crown. The remaining pieces were mounted or kept as loose stones.

All nine are now held by the British royal family. They are classified as Crown Jewels and are not available for sale or transfer.

The Hope Diamond was originally found in a mine in India. Its exact discovery date is not recorded, but the stone was notably large in its uncut form. In 1668, King Louis the Fourteenth purchased it and ordered it to be recut into a smaller shape. It became known at the French court as the Blue Diamond of the Crown.

The stone disappeared during the French Revolution. Someone took it, and for years its location was unknown. It resurfaced in London some time later under unclear circumstances.

In 1824, a banker named Henry Philip Hope acquired the diamond. It has carried his name ever since. The stone passed through several more owners over the following century. In 1949, a jeweler named Harry Winston purchased it and later donated it to the Smithsonian Institution in Washington.

The diamond sits in a metal setting surrounded by 340 smaller diamonds. It is one of the most visited objects in the museum.

Most people will never own a stone like the Hope Diamond. But the look it represents, icy blue, internally flawless, surrounded by brilliant white diamonds, is exactly the aesthetic IceCartel has built its collections around. 

Browse IceCartel's VVS diamond jewelry if you want that same energy without the Smithsonian price tag.

In 1986, miners at a South African mine uncovered an unusually large rough diamond. The stone was heavy and uncut. It was clear from the start that it required a specialist.

A diamond cutter named Gabi Tolkowsky was selected for the job. The cutting process alone took 154 days. That figure is worth pausing on. Most diamonds are cut in a matter of hours or days. This one demanded a different level of attention.

The team made a deliberate decision during the process. They chose to remove a significant portion of the rough stone rather than preserve the carat weight. The result was a finished diamond with no visible flaws and the highest possible color grade. Stones of that size rarely achieve both at the same time.

The diamond was presented to the public in 1991. The occasion was a large event organized to mark the anniversary of the company that produced it.

De Beers recovered a large rough diamond in South Africa in 1999. The stone was handed to a team of specialists for cutting and shaping. The work took years.

In 2013, the finished diamond was offered for sale at 81 million dollars. No buyer came forward at that price and the stone was withdrawn.

Four years later, the diamond returned to auction in Hong Kong. A businessman named Henry Cheng Kar Shun placed a bid over the phone and won. He paid a price that broke the record for any diamond ever sold at public auction. He renamed the stone the CTF Pink Star in memory of his father.

That record has not been broken since.

The diamond was originally listed under the name Fancy Vivid Blue Diamond. Harry Winston purchased it in 2014 and renamed it. The new name was not a marketing decision. It was a personal one, though the details behind it remained private.

At the time of its sale, no blue diamond of its size had ever sold for a higher price per carat. That record stood on its own.

Experts who examined the stone confirmed it was the largest blue diamond of its type ever submitted for testing. The shape is a pear cut. The interior has no visible flaws. Those two qualities together are uncommon in diamonds of any size. In a stone this large, they are considered exceptional.

The auction was competitive. Several serious buyers pursued it before a final price was reached.

The diamond was discovered in a mine in India. For several centuries it remained in the hands of European royal families, passing through Spain and then Germany. In 1772, a woman named Maria Amalia brought it to Bavaria as part of her marriage arrangements. It stayed within royal collections for a long time after that.

In 2008, a jeweler named Laurence Graff purchased the stone. He made a decision that proved controversial. Graff ordered the diamond to be recut. The stated reason was to improve the color and remove internal marks that had been present for years.

The response from experts was not positive. Many felt the recut was unnecessary. The diamond lost carat weight in the process, and that loss was considered significant for a stone with that kind of history.

The results, however, were difficult to argue with. The blue color became noticeably deeper. The stone also achieved a flawless clarity grade after the work was completed.

Graff sold the diamond in 2011. The buyer was the leader of Qatar. The final price was 80 million dollars.

The Perfect Pink weighs 14.23 carats. That number alone does not explain why it is considered remarkable. The more significant detail is that the stone carries a deep pink color at that size. The two qualities rarely appear together in a natural diamond.

The stone has minor internal marks. This is not unusual for a diamond of this weight. Experts who graded it did not consider those marks a meaningful reduction in value.

The diamond was sold at auction in Hong Kong. The buyer chose to remain anonymous. No name was recorded, and the stone has not been seen publicly since. Its current location is not known.

Blue diamonds are rare. Within that category, most carry some degree of gray or black in their color. The Heart of Eternity does not. Its blue is described as vivid and clean, which places it in a separate class from the majority of blue diamonds on record.

The stone was cut from a larger rough diamond recovered at a mine in South Africa. A consortium of experts acquired it first. De Beers purchased it from them and formally introduced the diamond to the public in 2000.

Ownership after that point is unclear. De Beers no longer lists it among its holdings. No buyer has been publicly identified. Where the diamond is currently kept is not known.

A farmer in Brazil came across the diamond sometime in the 1990s. The exact date was not recorded. The stone was originally known as the Red Shield before it received its current name.

It holds a significant distinction. Testing confirmed it as the largest natural red diamond ever graded. Red diamonds are considered the rarest color category in existence. Pink and blue diamonds are uncommon, but red ones are found far less frequently.

The cut is a triangle. That is an unusual choice for any diamond, let alone one of this rarity. The decision to cut it that way rather than into a more traditional shape has drawn attention on its own.

The diamond was exhibited at a museum in Washington D.C. in both 2003 and 2005. It was included in a display that brought together eight of the most exceptional diamonds in the world.

These diamonds are exclusive and come with huge price tags. Most of them are currently unobtainable. So, the diamond lovers are currently moving towards lab grown ones. Here’s a complete history of the lab grown diamonds.

This table will answer your question regarding what the most expensive diamond in the world is. It is the Pink star also known as CTF pink star. Sold at $71.2 million.

These prices are for one stone. If you want the same diamond-quality brilliance in a full piece of wearable jewelry, IceCartel builds VVS moissanite chains, pendants, and tennis bracelets that pass diamond testers and ship in under a week.

The value of a diamond depends on four things. These are called the 4Cs. Robert Shipley started this way of grading diamonds. And today the whole world uses it to grade diamonds.

For a full breakdown of how each grade is assessed, read our guide on the diamond grading scale.

The diamonds in this guide are collector artifacts. They live in vaults, crown jewels, and private collections. None of them are for sale, and the ones that occasionally appear at auction go for tens of millions of dollars.

But the visual language of diamonds, the white flash, the icy brilliance, the VVS clarity, is something you can wear every day.

IceCartel is a Houston-based jewelry brand with over 30 years of experience crafting iced-out pieces. Every stone is VVS grade moissanite, colorless and GRA-certified. Moissanite scores 9.25 on the Mohs hardness scale, passes handheld diamond testers, and is optically cleaner than most natural diamonds at equivalent price points.

Their pieces have been worn by Rick Ross, Fivio Foreign, Lil Pump and over 30,000 other customers worldwide.

The most expensive diamonds in the world are not just gemstones. They are a huge part of history. Every stone in this list carries a story that spans centuries and different continents. You'll find that the most valuable diamonds have the most fascinating histories.

Diamonds are not just pricey collectibles; they have been worn as jewelry throughout history. So, if you want to bring the bling and want to attract people, diamond jewelry is a go-to option. But don’t forget to check the 4Cs and certification before buying.

Diamonds are expensive. The stones in this guide are beyond the reach of any private buyer. But the look, the VVS clarity, the iced-out brilliance, the weight of a well-crafted piece, is something you can actually own. IceCartel crafts VVS moissanite jewelry for over 30k people worldwide. 

Every piece ships with a GRA certificate and arrives in under a week. If you want diamond-quality jewelry in 2026, that is where you start.