Imagine a single diamond worth more than a luxury mansion, a private jet and a collection of supercars combined. At the highest level of the gemstone world, rarity can turn a few carats of crystallised carbon into an object worth tens of millions of dollars.
Pink, blue and other naturally coloured diamonds dominate this extraordinary market because stones combining intense natural colour, large size and exceptional clarity are almost impossible to find.
For a fair comparison, this ranking uses documented auction prices. Famous royal diamonds such as the Koh-i-Noor and Cullinan I are not included because they have never been offered on the open market and do not have directly comparable sale prices.
1. CTF Pink Star – $71.2 Million
The CTF Pink Star remains the most expensive diamond ever sold at auction, achieving an astonishing $71.2 million at Sotheby’s Hong Kong in April 2017.
The oval mixed-cut stone weighs 59.60 carats and is graded Fancy Vivid Pink and Internally Flawless. According to Sotheby’s, it is the largest Internally Flawless Fancy Vivid Pink diamond ever graded by the Gemological Institute of America.
Its story began with a 132.5-carat rough diamond mined by De Beers in Africa in 1999. Cutting and polishing the stone reportedly required around two years. Its extraordinary combination of size, vivid natural pink colour and flawless internal appearance places it in a category that virtually no other diamond can match.
2. Williamson Pink Star – $57.7 Million
The Williamson Pink Star caused a sensation when it sold at Sotheby’s Hong Kong in October 2022 for HK$453.2 million, or approximately $57.7 million.
Despite weighing only 11.15 carats, the cushion-shaped diamond achieved more than $5.17 million per carat, setting a world auction record price per carat for any diamond or gemstone at the time of its sale.
It carries the highly desirable grades of Fancy Vivid Pink, Internally Flawless and Type IIa. The rough diamond was recovered from Tanzania’s Williamson mine, famous for producing exceptional pink stones, including the Williamson Pink Diamond presented to Queen Elizabeth II as a wedding gift.
Its intense unmodified pink colour is exceptionally difficult to find in a diamond of this size, explaining why bidders pushed it to nearly $58 million.
3. Oppenheimer Blue – $57.54 Million
The Oppenheimer Blue became the world’s most expensive jewel ever auctioned when Christie’s sold it in Geneva in May 2016 for $57,541,779.
The rectangular-cut diamond weighs 14.62 carats and received the coveted Fancy Vivid Blue colour classification.
Its name comes from its connection to Sir Philip Oppenheimer, whose family played a central role in the history of De Beers and the international diamond industry.
Large natural blue diamonds are extraordinarily scarce, and stones displaying the strongest Fancy Vivid colour grade are rarer still. After approximately 25 minutes of bidding, the Oppenheimer Blue established what was then a new world auction record for any jewel.
4. De Beers Blue – $57.47 Million
Only a tiny amount separated the De Beers Blue from the Oppenheimer Blue when it appeared at Sotheby’s Hong Kong in April 2022.
The magnificent 15.10-carat step-cut Fancy Vivid Blue diamond sold for HK$450.925 million, or $57,471,960.
The stone originated from an exceptional rough diamond discovered at South Africa’s famous Cullinan Mine in 2021. It was then shaped and polished over an extended period to reveal its extraordinary blue colour.
At the time of sale, it was the largest Fancy Vivid Blue diamond ever offered at auction. Its size is particularly significant because natural blue diamonds of more than 10 carats with this level of colour are exceptionally uncommon.
5. Winston Pink Legacy – $50.38 Million
The Winston Pink Legacy, originally known as the Pink Legacy, sold at Christie’s Geneva in November 2018 for CHF50.375 million, approximately $50.38 million.
The rectangular-cut stone weighs 18.96 carats and has been graded Fancy Vivid Pink. Its rich, evenly distributed pink colour attracted enormous attention before the auction.
Christie’s noted that Type IIa diamonds such as the Pink Legacy are among the most chemically pure diamonds and represent only a very small proportion of gem diamonds.
The stone had also descended from the famous Oppenheimer family. After buying it, Harry Winston renamed it the Winston Pink Legacy. The combination of provenance, significant size and exceptionally saturated natural colour pushed its price beyond $50 million.
6. Blue Moon of Josephine – $48.47 Million
The Blue Moon of Josephine became one of the world’s most famous blue diamonds when it sold at Sotheby’s Geneva in November 2015 for $48,468,158.
The cushion-shaped diamond weighs 12.03 carats and is graded Fancy Vivid Blue and Internally Flawless. It was cut from a 29.62-carat rough stone discovered at the Cullinan mine in South Africa in 2014.
At the time of sale, its price of more than $4 million per carat established an extraordinary record for any diamond or gemstone.
The buyer subsequently renamed the stone the Blue Moon of Josephine. Its exceptional colour, flawless clarity and traceable journey from mine to finished jewel helped turn it into one of the defining diamonds of the modern auction era.
7. Graff Pink – Around $46 Million
The Graff Pink held the world auction record for a jewel before newer record-breaking diamonds eventually surpassed it.
When Sotheby’s offered the diamond in Geneva in November 2010, the then 24.78-carat Fancy Intense Pink diamond sold for approximately $46 million to billionaire jeweller Laurence Graff.
The stone had previously belonged to legendary New York jeweller Harry Winston. After purchasing it, Graff had the diamond carefully recut and polished.
The process reduced its weight to 23.88 carats but improved its clarity to Internally Flawless. Its exceptional size, Type IIa classification, distinguished ownership history and intense natural pink colour have made the Graff Pink one of the world’s most recognisable diamonds.
8. Bleu Royal – $44.01 Million
The Bleu Royal entered the top level of the diamond market when it sold at Christie’s Geneva in November 2023 for CHF39.505 million, or $44,009,645.
The pear-shaped stone weighs 17.61 carats and combines two of the most desirable characteristics possible in a blue diamond: Fancy Vivid Blue colour and Internally Flawless clarity.
Before the auction, the diamond had remained in the same private collection for around four decades. Large vivid-blue stones rarely come to market, making the appearance of a diamond of this quality a significant event for collectors.
Bleu Royal became the most expensive jewel sold at auction anywhere in the world during 2023.
9. Princie Diamond – $39.32 Million
The Princie Diamond combines extraordinary colour with a history stretching back centuries.
The 34.65-carat cushion-cut Fancy Intense Pink diamond sold at Christie’s New York in April 2013 for $39,323,750.
The stone originated from India’s legendary Golconda mines and was once owned by the Nizams of Hyderabad. It appeared at auction in 1960, when Van Cleef & Arpels purchased it and later named it “Princie.”
Its unusual orange fluorescence also helps distinguish the stone. Christie’s reported that extremely few diamonds examined by the GIA display this rare phenomenon. Size, Golconda origin, royal provenance and natural pink colour combined to make the Princie one of history’s most valuable auctioned diamonds.
10. The Orange – $35.54 Million
Most record-breaking coloured diamonds are pink or blue, which makes The Orange particularly remarkable.
The 14.82-carat pear-shaped Fancy Vivid Orange diamond sold at Christie’s Geneva in November 2013 for $35,540,612.
At the time, it was the largest Fancy Vivid Orange diamond ever offered at auction. Its price of around $2.4 million per carat also established a new world auction record per carat for any diamond at that time.
Pure orange is an exceptionally unusual natural diamond colour. The combination of substantial size, strong colour saturation and rarity created fierce collector interest and turned The Orange into the benchmark against which other orange diamonds are measured.
What Makes the World’s Most Expensive Diamonds So Costly?
The world’s rarest diamonds can reach extraordinary prices because several exceptional characteristics must occur in the same stone.
Natural colour: Fancy Vivid pink and blue diamonds are especially prized. Sotheby’s notes that fewer than 0.15% of diamonds submitted to the GIA possess predominantly pink colour.
Colour intensity: Fancy Vivid stones generally command more attention than diamonds with weaker colour saturation.
Carat weight: Large coloured diamonds are exponentially rarer than small examples, particularly when they exceed 10 or 20 carats.
Clarity: Internally Flawless diamonds contain no internal inclusions visible under standard grading magnification, making an already rare coloured stone even more exceptional.
Origin and provenance: Connections with famous mines, royal families, collectors or houses such as Harry Winston can add significant historical importance.
Exceptional cutting: Master cutters sometimes spend months or years studying a rough stone to preserve maximum weight while producing the strongest possible colour, clarity and brilliance.
Final Word
The world’s most expensive diamonds prove that rarity matters more than size alone. An 11-carat vivid pink diamond can be worth far more than a much larger ordinary colourless stone because nature produces such gems in extraordinarily small numbers.
With the $71.2 million CTF Pink Star still holding the global auction record, these diamonds sit somewhere between natural wonders, jewellery and collectible works of art.
