By Daniel Carter, Gemologist | Driona Jewels | June 29, 2026

Cursed, Stolen & Sold: The Dark History Behind the World's 6 Most Expensive Natural Diamonds

The world's most expensive natural diamonds aren't just gemstones. They're centuries of war, theft, royal intrigue, and one spectacularly dramatic auction in Hong Kong. Here's what you actually need to know: the six most expensive natural diamonds in history are the Kohinoor, the Cullinan, the Hope Diamond, the Centenary, the Pink Star (originally called the Steinmetz Pink), and the Sancy. Together they span three continents, six centuries, and billions of dollars in contested value. What separates a $500 million diamond from a $6 million one isn't just size. It's cut quality, provenance, color rarity, and the kind of paper trail that modern grading bodies like GIA and IGI have only provided in the last century. The Sancy, one of the oldest famous diamonds in existence, is worth a fraction of the others. I'll explain exactly why, and most diamond listicles don't bother to.

I've spent years grading and appraising stones. These six taught me more about value than almost anything else. Let's get into them, starting with the one no one can legally own.

Why Are Some Natural Diamonds Priceless, While Others Sell for "Only" $6 Million?

Diamond value isn't a single number. It's the product of four variables working together: carat weight, color grade, clarity grade, and cut quality (the 4Cs). Then layer in provenance (documented ownership history), rarity of color, and certification by a recognized grading body. Change any one of those factors and the value shifts dramatically. The Kohinoor and the Sancy are both famous, both historic, both over 50 carats. One is considered priceless. The other is worth roughly $6 million. The difference comes down to cut technology, color rarity, and 400 years of contested paperwork. This table gives you the full picture before we dive into the stories.

The Kohinoor: Does the World's Most Controversial Diamond Belong to Britain or India?

The Kohinoor (Persian for "Mountain of Light") almost certainly came from the Kollur Mine in what is now Andhra Pradesh, India. Records trace it to the Mughal court in the early 17th century, where it sat in Shah Jahan's legendary Peacock Throne. Then Persian ruler Nader Shah raided Delhi in 1739 and took it. Then it passed to Afghan rulers, then to Sikh Emperor Ranjit Singh, and finally to a ten-year-old boy named Duleep Singh, who "gifted" it to Queen Victoria in 1850 after the British East India Company annexed the Punjab. That's a diplomatic way of saying it was taken under coercion from a child king.

It now sits in the Tower of London, set in the late Queen Mother's crown. India, Pakistan, Iran, and Afghanistan have all formally requested its return. During the 2023 coronation of King Charles III, the palace quietly kept it off Queen Camilla's crown, citing that it would be "inappropriate" following the Queen Mother's death. Most observers read it differently: the optics of a king wearing a colonially acquired diamond at his own crowning were untenable. According to Smithsonian Magazine, no British law actually allows its return regardless of political will.

The curse attached to it, drawn from a Hindu text, states that only God or a woman can wear the Kohinoor without suffering misfortune. Every male ruler who possessed it faced violence or downfall. It's been owned exclusively by queens since arriving in Britain, possibly by design. You can read more about the full curse legend on the Natural Diamonds Council's historic diamond archive. From a grading standpoint, the Kohinoor is colorless (effectively a D-equivalent), but it was cut before modern proportioning existed. Its oval brilliant form today reflects its 19th-century British recut, which actually reduced it from 186 carats to 105.6 in pursuit of more sparkle. They got more brilliance. They lost nearly half the stone.

The Cullinan: How Do You Cut the Largest Diamond Ever Found Without Shattering It?

In January 1905, a mine superintendent named Frederick Wells was doing his afternoon inspection of the Premier Mine near Pretoria, South Africa when he spotted something reflecting light from the mine wall at 18 feet deep. It was a 3,106-carat rough diamond, the size of a man's fist. They named it after the mine's chairman, Thomas Cullinan. Its value in today's money is estimated at over $400 million, across the 105 gems it eventually became.

The cutting is where the story gets genuinely terrifying. Joseph Asscher of Amsterdam was handed the world's largest diamond and asked to cleave it. He studied it for months. He identified the grain. He made the mark. Then he struck it once with a specially made steel blade. The blade broke. The diamond didn't. He tried again. This time it split perfectly along the cleavage plane he'd mapped. Asscher reportedly fainted from the stress. The Cullinan was ultimately cut into 9 major stones and 96 smaller brilliants. Cullinan I, the 530-carat pear brilliant now known as the Star of Africa, is the largest colorless cut diamond in existence and is set in the British Royal Sceptre (you can view it at the Royal Collection Trust). If you're curious about how the pear brilliant cut compares to other shapes in terms of light performance, it remains one of the most optically efficient fancy cuts ever devised.

The Hope Diamond: What Actually Makes It That Impossible Shade of Blue?

The Hope Diamond is 45.52 carats of deep blue, and people have been explaining its color wrong for decades. It's not "a blue diamond." It's a Type IIb diamond, the rarest category in the GIA classification system, occurring in fewer than 0.1% of all natural diamonds. Type IIb stones contain boron impurities in their crystal lattice. Boron absorbs red and yellow light wavelengths, which is what your eye perceives as blue. The Hope's boron was embedded during formation approximately 1.1 billion years ago at depths exceeding 100 miles below the earth's surface. GIA's research on Type IIb diamonds makes clear that no two are identical in their precise boron distribution, which is part of why the Hope's color is unreplicable in nature. It also glows vivid red under ultraviolet light, a direct result of the same boron-nitrogen interaction. Most visitors at the Smithsonian National Museum of Natural History never know this is happening when the lights dim for the viewing.

The stone's journey from India's Golconda mines (via French traveler Jean-Baptiste Tavernier, who sold it to Louis XIV in 1668) through the French Revolution, a London banker named Henry Hope, and eventually Harry Winston is well documented. Winston donated it to the Smithsonian in 1958 by mailing it in a plain brown paper package via registered US mail, insured for $1 million. The stamp cost him $2.44. The curse surrounding it, which allegedly caused bankruptcy and tragedy for its owners, was almost certainly invented by journalists in the early 20th century to boost interest in the stone. Good marketing. Still works today.

The Centenary Diamond: Why Did De Beers Cut the World's Most Perfect Diamond in a Vibration-Free Room?

The Centenary Diamond was found at South Africa's Premier Mine in 1986, the same mine that produced the Cullinan 81 years earlier. At 599 carats rough, it was the third-largest gem-quality diamond ever recovered. De Beers presented it publicly in 1988 to mark the company's centenary. Then they handed it to master cutter Gabi Tolkowsky and said: make this perfect.

Tolkowsky built a sealed, vibration-free chamber in the Premier Mine itself for the cutting. The reason is simple: at 273 carats, any vibration from machinery, traffic, or even footsteps could introduce a fracture along the stone's internal grain lines. He and his team worked for 154 days. The result was a modified heart shape with 247 facets, graded D color (the highest possible) and internally flawless. De Beers insured it for over $100 million, though the actual purchase price and current owner have never been publicly confirmed. What we know is that the Centenary Diamond achieved what the entire industry considers impossible: a D Flawless grade at 273 carats. For context, most D Flawless diamonds that appear at auction weigh under 20 carats.

The Pink Star: How Did a Stone Called Steinmetz Pink Become a $71.2 Million Auction Record?

In 1999, De Beers recovered a 132.5-carat rough pink diamond from a South African mine. They handed it to the Steinmetz Diamond Group, who spent 20 months cutting it into a 59.60-carat oval brilliant with internally flawless clarity. The GIA graded it Fancy Vivid Pink: the highest saturation level in the pink color grade, occurring in fewer than 0.0001% of all diamonds. They called it the Steinmetz Pink and unveiled it at Monaco in 2003.

In 2017, it sold at Sotheby's Hong Kong for $71.2 million, setting the all-time world record for any diamond or gemstone sold at auction. The buyer was Chow Tai Fook Enterprises, who renamed it the CTF Pink Star in memory of the company founder's late father, Cheng Yu-Tung. Many articles still refer to it as the Steinmetz Pink or Pink Star interchangeably, which creates real confusion. Same stone, three names, one owner. According to the Natural Diamonds Council, the pink color in diamonds comes from structural distortions in the crystal lattice created by intense pressure during formation, not from trace elements like boron. It's among the rarest fancy colors precisely because the mechanism that causes it is so unpredictable.

The Sancy Diamond: Why Is the World's Oldest Famous Diamond Worth the Least?

The Sancy weighs 55.23 carats. It's famous. It's been owned by kings and empresses. It sat in the French crown jewels. It currently lives at the Louvre in Paris, acquired in 1978. And its estimated value is around $6 million, roughly 1% of the Hope Diamond's. Nobody in most diamond listicles explains why. Here's the actual reason.

The Sancy was cut in the Indian old mine double rose style, likely in the late medieval period. Rose cuts and double rose cuts have no pavilion: they're essentially flat on the bottom, with facets only on the dome above. This means light enters the stone, bounces around, and exits almost directly back out the top without the angles needed to create the internal reflection that makes modern brilliant-cut diamonds sparkle. A modern brilliant-cut diamond of 55 carats, D color, flawless, would be worth tens of millions. The Sancy's cut loses the majority of that potential value. Add to that the fact that it carries no GIA or IGI certificate (it predates both organizations by centuries) and that its ownership chain from the 1570s through the 18th century is genuinely disputed by historians. Provenance and grading documentation are the foundation of modern diamond value. The Sancy predates both by nearly 400 years. That's why it's at the Louvre and not on the auction block at $71 million.

What These 6 Diamonds Teach Modern Buyers (And What You Can Actually Own)

Every one of these diamonds is a master class in what makes a stone valuable. And while you can't buy a Type IIb blue diamond or a 530-carat pear brilliant, the lessons they teach directly apply to what you can buy. As we covered in our complete guide to natural diamonds vs. lab-grown diamonds, lab-grown diamonds are chemically and physically identical to their natural counterparts: same crystal structure, same optical properties, same hardness of 10 on the Mohs scale. What differs is origin, rarity, and price (typically 30 to 50% less than comparable natural diamonds). Here's what each famous stone teaches you about choosing your own:

The Kohinoor teaches oval cuts. The oval brilliant maximizes carat weight visually, appearing larger than a round diamond of the same carat. It's also more forgiving on different hand proportions. If the oval's elongated shape speaks to you:

The Cullinan teaches pear cuts and round brilliants. Cullinan I is the defining pear brilliant. The round brilliant cut, which most Cullinan sub-stones became, remains the most optically efficient shape ever calculated. If you want maximum light return per carat, a round brilliant lab diamond is the technical answer.

The Centenary teaches the heart cut. The heart is the rarest fancy shape: it requires flawless symmetry or the two lobes look uneven. De Beers chose it for their most perfect diamond because the shape demands an extraordinary stone to carry it.

The Pink Star teaches oval vivid color. You can't buy a $71 million fancy vivid pink. But the oval brilliant that showcased it is accessible. And if you want to understand which metal color best complements your lab diamond, a rose gold setting amplifies warm tones in exactly the way the Pink Star's mount did.

FAQ: 6 Questions People Actually Ask About Famous Diamonds