Okay so when people say diamonds are expensive, most are thinking like $5,000 for an engagement ring. That's cute.
The most expensive diamonds in the world don't operate in that world. We're talking $29 million on the low end. Hundreds of millions in the middle. And one stone that no government on earth will ever put a number on.
This list ranks the 10 most valuable diamonds ever documented — lowest to highest. Real prices, real facts, no fluff.
The Koh-i-Noor — Priceless
Carat weight: 105.6 carats (current polished form)
Color/Type: Colorless
Real talk: The Koh-i-Noor has no market price because no market will ever get to touch it. The Kohinoor diamond worth is genuinely incalculable — and not in the exaggerated way people use that word. There is no number. India wants it back. Pakistan wants it back. Iran has claimed it. Afghanistan has claimed it. The British Crown has it and is not discussing it. Centuries of wars, thrones, and empires were tied to this stone. No government has officially valued it. It is not for sale. It will never be for sale. The only diamond on this entire list that sits above billions — because even billions feels like the wrong unit.
Current location: British Crown Jewels, Tower of London
The Sakura Diamond — $29.3 Million
Carat weight: 15.81 carats
Color/Type: Fancy Vivid Purple-Pink, Internally Flawless
Real talk: This sold at Christie's Hong Kong in May 2021 and broke the per-carat record for a purple-pink diamond at auction. 15 carats and this is what it goes for. Insane.
Current owner: Private collector
The Orange Diamond — $35.5 Million
Carat weight: 14.82 carats
Color/Type: Fancy Vivid Orange — and yaar, Fancy Vivid is the highest orange color grade that even exists
Real talk: Sold at Christie's Geneva in November 2013. Natural vivid orange diamonds are so rare that most diamond dealers never see one in their entire career. Not exaggerating.
Current owner: Private collector
The Lesotho Legend — $40 Million
Carat weight: 910 carats — rough, uncut, straight from the ground
Color/Type: Colorless, gem-quality rough diamond
Real talk: Found in Lesotho, Africa, in January 2018. Fifth-largest gem-quality rough diamond ever recovered. And it sold as-is, rough and uncut, for $40 million. Someone paid $40M for a rock they still had to pay extra to cut. Respect honestly.
Current owner: Private buyer (sold at tender, 2018)
The Graff Pink Diamond — $46.2 Million
Carat weight: 24.78 carats
Color/Type: Fancy Intense Pink, Internally Flawless
Real talk: Sold at Sotheby's Geneva in November 2010. Jeweler Laurence Graff bought it, renamed it after himself, and at the time it set the world auction record for any jewel — not just diamonds, any jewel. Bhai, when you spend $46M on something, you get to name it whatever you want.
Current owner: Graff Diamonds
The Blue Moon of Josephine — $48.4 Million
Carat weight: 12.03 carats
Color/Type: Fancy Vivid Blue, Internally Flawless — highest possible grade in both color and clarity for a blue diamond
Real talk: Sold at Sotheby's Geneva in November 2015 for $48.4 million. That works out to $4 million per carat. Hong Kong businessman Joseph Lau bought it and named it after his daughter Josephine. Honestly, buying your kid a $48M diamond is a different level of dad energy.
Current owner: Joseph Lau (private collection)
The CTF Pink Star — $71.2 Million
Carat weight: 59.60 carats
Color/Type: Fancy Vivid Pink, Internally Flawless — and it's the largest diamond to ever receive both of those grades at once
Real talk: This is the most expensive diamond ever sold at auction. Full stop. Sold at Sotheby's Hong Kong in April 2017 for $71.2 million. Originally called the Pink Star, Chow Tai Fook Enterprises bought it and renamed it CTF. That record has not been broken since. The most expensive diamond ever sold, and it's not even colorless — it's pink.
Current owner: Chow Tai Fook Enterprises, Hong Kong
The De Beers Centenary Diamond — $100 Million+
Carat weight: 273.85 carats
Color/Type: D color (colorless), Flawless — the literal maximum grade in both color and clarity
Real talk: De Beers unveiled this in 1991 at their own centenary celebration — basically threw a party and showed up with a $100M+ stone as the centerpiece. It has never been sold publicly. A D Flawless diamond at 273 carats is genuinely one of a kind on this planet. De Beers is just holding it. Not for sale. Not even a conversation.
Current owner: De Beers (never publicly sold)
The Hope Diamond — $200-250 Million
Carat weight: 45.52 carats
Color/Type: Fancy Dark greyish-blue — the deep blue comes from trace amounts of boron trapped inside the crystal structure
Real talk: The Hope Diamond has had more owners than most people have had jobs. King Louis XIV of France wore it. British banker Henry Hope gave it the name. American socialite Evalyn Walsh McLean bought it. Eventually it ended up donated to the Smithsonian where it lives now behind glass. Estimated Hope Diamond value sits between $200-250 million and it hasn't been publicly sold in the modern market. For anyone trying to understand how blue diamond color grades actually work, the complete diamond color grading guide breaks it down properly.
Current location: Smithsonian Institution, Washington, D.C.
The Cullinan Diamond — Up to $2 Billion
Carat weight: 3,106.75 carats (rough) / Cullinan I: 530.4 carats (polished)
Color/Type: Colorless — the largest gem-quality rough diamond ever found in recorded history
Real talk: Found in South Africa in 1905 at 3,106 carats rough. They cut it into 9 major stones and 96 smaller ones. The biggest piece, the Cullinan I (also called the Star of Africa), came out at 530.4 carats polished. That is the largest colorless polished diamond on earth. The Cullinan Diamond price and Star of Africa diamond price don't officially exist because both sit in the British Crown Jewels as sovereign property. Total estimated value for all Cullinan stones combined: over $2 billion. The British government is just casually holding $2 billion in diamonds from a mine in South Africa. Cool cool.
Current location: British Crown Jewels, Tower of London
Most Expensive Diamond Cut (And Why It Actually Matters)
Okay real talk — the round brilliant cut is the most expensive diamond cut, and it's not even close.
It returns the most light, produces the most sparkle, and the cutting process wastes more raw material than any other shape. That wasted material is baked into the price per carat.
A round brilliant diamond of the same carat, color, and clarity will cost 20-40% more than a fancy-shape stone. Every time. The full breakdown of how cut affects brilliance — for both diamonds and moissanite — is in the best diamond cuts guide.
Most Expensive Diamond Color (This One Surprises People)
Most people guess blue. Or pink. Both wrong. Red is the most expensive diamond color in the world.
Fewer than 30 natural red diamonds are confirmed to exist globally. A pure red with no brownish or purplish secondary color is virtually impossible to source — not rare, basically impossible. The Moussaieff Red (5.11 carats, Fancy Red) is estimated above $20 million despite being just 5 carats. After red, Fancy Vivid Pink and Fancy Vivid Blue are the next most expensive colored diamonds. The CTF Pink Star and Oppenheimer Blue sold for proof. Red diamonds are the rarest diamond in the world by color classification — and most people have never even seen one in person.
Conclusion
So to recap — the most expensive diamonds in the world are expensive because of rarity, color grade, carat weight, and in some cases, history that goes back centuries. Red diamonds are rarest by color. Round brilliant is most expensive by cut. The Cullinan holds the highest dollar estimate. The Koh-i-Noor doesn't have a number at all.
For anyone researching high-brilliance stones for rings or pendants without the $29M entry point, browsing the full jewelry catalog is a solid starting point. Please review the returns policy before purchase.
FAQs
What is the most expensive diamond in the world?
Depends on how you define it. The Koh-i-Noor is considered priceless with no market value. The Cullinan Diamond is estimated at up to $2 billion. For publicly sold stones, the CTF Pink Star holds the record at $71.2 million at auction.
What is the most expensive diamond ever sold at auction?
The CTF Pink Star — $71.2 million, Sotheby's Hong Kong, April 2017. A 59.60-carat Fancy Vivid Pink, Internally Flawless diamond. That record still stands.
What is the most expensive diamond cut?
Round brilliant. No debate. It removes more raw material during cutting than any other shape, which pushes the per-carat price 20-40% higher than equivalent fancy shapes.
What is the Hope Diamond value?
Estimated between $200-250 million. The 45.52-carat Fancy Dark greyish-blue diamond is at the Smithsonian and hasn't been publicly sold in the modern era. If you want to understand how rare color grades like blue are actually classified, the diamond color grading guide explains it well.
What is the Cullinan Diamond price?
There is no official price. The Cullinan I (530.4 carats) is part of the British Crown Jewels — not for sale, not valued publicly. Total estimated value of all Cullinan stones combined is over $2 billion.
What is the Koh-i-Noor diamond worth?
Officially? Nothing — because no official valuation exists. Realistically? Priceless, and contested by at least four countries. It is set in the British Crown and is not going anywhere anytime soon.
Is there a more affordable option if you want diamond-level brilliance?
Honestly yes — moissanite. It scores 9.25 on the Mohs hardness scale and actually produces more brilliance per carat than most natural diamonds. For buyers who want the look without the $29M starting price, VVS moissanite jewelry is worth exploring. Full comparison of both stones is in the moissanite vs diamond guide.
