What is the world record price for a diamond at auction?

The Pink Star diamond holds the world record for the highest price paid for a diamond at auction, selling for $71.2 million.

Why are coloured diamonds so valuable?

Coloured diamonds such as pink and blue are extremely rare. Their colours result from unique natural conditions during formation, making them far rarer and more valuable than colourless diamonds.

Where can famous diamonds be viewed?

Some famous diamonds, such as the Hope Diamond and the Koh-i-Noor, are displayed in museums like the Smithsonian Institution and the Tower of London. Diamonds sold at auction are usually held in private collections.

Has any diamond sold for more than the Pink Star recently?

No diamond has surpassed the Pink Star’s auction record so far. While several high-value diamonds continue to be sold, the Pink Star remains the most expensive at auction.

The Most Expensive Diamonds in the World (2025 List)

Q: What is the world’s most costly diamond?

The Koh-i-Noor diamond is often described as priceless due to its historical significance. Among diamonds sold at auction, the Pink Star holds the record as the most expensive, selling for $71.2 million.

Diamonds have long fascinated us. They’re not only pretty stones. They’re harbingers of luxury, history, and sometimes mystery.

If you want to know the most costly diamond in the world or learn about the world record price of a diamond, you’ve found the right site. On this 2025 list, we’ll look at the most valuable diamonds, from priceless stones with royal connections to record-breaking auction sensations. These stunners are not only about sparkle; they have incredible tales of finding, owning, and having sky-high prices. We’ll keep it simple and enjoyable, like sitting over coffee talking about the ultimate bling.

Whether you are a jewellery enthusiast or simply appreciate a good story of prosperity, this list runs through the most prominent diamonds that made headlines. Prices will vary on the basis of estimates or auctions, but as of 2025, these are the ones that topped our list:

1. Kohinoor: The Priceless Crown Jewel

The Kohinoor tops our list of most valuable diamonds, commonly referred to as the most costly diamond in the world, despite the fact that you can’t actually price it! The fabled stone measures 105.6 carats and originated in India’s Golconda mines centuries ago. Its name translates to “Mountain of Light”.

The Kohinoor has a history full of drama. It travelled through empires, from Mughal emperors to Persian conquerors, before it ended up with the British monarchy in the 19th century. Now, it’s encased in the Queen Mother’s crown, on display at the Tower of London. Its worth, say experts, is unquantifiable because of its size, purity, and historical weight. No auction would ever be able to equal its value. It’s an icon of power and scandal. If diamonds could speak, then this one would have stories of wars and kingdoms.

2. The Cullinan Diamond: Value Up to $400 Million

Second in line is the Cullinan, a monster of a diamond found in South Africa in 1905. It was originally a staggering 3,106 carats in the rough and was divided into nine principal stones and others. The largest, Cullinan I (or the Great Star of Africa), weighs 530.4 carats and rests in the British Sovereign’s Sceptre.

Worth approximately $400 million, this diamond’s reputation is for being the largest gem-quality rough ever discovered. It was presented to King Edward VII in order to repair relations following the Boer War. The cuts are immaculate, with D-colour grading for purity.

Why is it so costly? Size is important, but so is its royal provenance and flawless clarity. In 2025, it is still a standard against which diamond value is measured, reminding us that nature has the power to create such enormous treasures.

3. The Hope Diamond: $200–350 Million of Enigma

Oh, the Hope Diamond! Infamous for its curse as well as its stunning beauty. This 45.52-carat fancy deep blue beauty resides at the Smithsonian in Washington, D.C. Its blue colouration is due to boron atoms and makes it extremely rare.

Appraised at $200 to $350 million, the Hope was mined in India during the 1600s; it was among French royal jewels before it disappeared during the Revolution. It reappeared in London, and today, it’s one of the most visited gems in the world. No recent sales record, but its worth continues to rise because of rarity and popularity.

4. De Beers Centenary Diamond: More than $100 Million

Commemorating De Beers’ centennial year in 1988, this 273.85-carat D-colour perfect diamond is a work of art. Carved out of a 599-carat rough discovered in South Africa, it has an exceptional heart shape with 247 facets to achieve maximum brilliance.

Worth more than $100 million, it’s internally perfect and colourless, the crème de la crème. It was unveiled in 1991 at the Tower of London but went into private ownership afterward. Enigma only adds to its charm. In the list of most valuable diamonds, it’s remarkable for having a modern history and flawless grading.

5. The Pink Star (CTF Pink Star): $71.2 Million World Record

We come now to the auction titans. The Pink Star is the world record diamond price, going for $71.2 million in 2017 at Sotheby’s Hong Kong. This 59.6-carat fancy vivid pink oval is internally flawless, having been cut from a 132.5-carat rough mined in 1999.

Purchased by Chow Tai Fook and renamed, it’s the largest vivid pink diamond to be graded by the GIA. Pink diamonds are scarce due to distortions in the crystal during formation. No sale of 2025 has surpassed this, so it is currently the world’s most costly diamond by auction. Its colour is reminiscent of a perfect sunset, engrossing and unique.

6. Williamson Pink Star: $57.7 Million

It was sold in 2022 for $57.7 million. The 11.15-carat fancy vivid pink cushion-cut diamond broke a per-carat record at $5 million. It was mined in Tanzania’s Williamson mine (renowned for pinks), and it’s oval-shaped and internally flawless.

The mystery buyer received a bargain in terms of rarity. Pink diamonds account for less than 0.1% of production, and such bright ones are rarer. In 2025, it’s still one of the leading entries in the list of most valuable diamonds, demonstrating smaller rocks can sell for massive amounts with ideal colour and clarity.

7. Oppenheimer Blue: $57.5 Million

This 14.62-carat fancy vivid blue rectangular diamond sold in 2016 for $57.5 million at Christie’s Geneva. Dubbed after diamond tycoon Philip Oppenheimer, it was the largest vivid blue to sell at auction at that time.

Blue diamonds owe their colour to boron, and this one’s royal. From South Africa, VVS1 clarity. Blues are extremely rare, created deep within the Earth. It used to break records until slightly being surpassed, but this year, 2025, it remains a blue icon on our list.

8. De Beers Cullinan Blue: $57.4 Million

Discovered in 2021 at the Cullinan mine, this 15.10-carat step-cut fancy vivid blue was sold for $57.4 million in 2022. Internally flawless and exquisite, it is the biggest vivid blue of its type.

Sold in a time of global events, it set per-carat records for blues. In 2025, with no other new blues having surpassed it, this diamond glows as the most expensive diamond in the world rankings for its new find and perfection.

9. The Pink Legacy: $50 Million

This 18.96-carat fancy vivid pink rectangular-cut diamond sold for $50 million at Christie’s in 2018. Formerly owned by the Oppenheimers, it was christened Winston Pink Legacy after being purchased by Harry Winston.

Mined in South Africa in 1920, it was worth $2.6 million per carat at the time; it was a record then. Pinks are disappearing as mines shut down, so its value may appreciate. A genuine legacy item on our 2025 list.

10. Blue Moon of Josephine: $48.4 Million

Sold in 2015 for $48.4 million, this 12.03-carat cushion-cut fancy vivid blue is internally flawless. Discovered in South Africa in 2014, it was bought by Joseph Lau and named for his daughter.

At over $4 million per carat, it set blue records. Its moon-like shape adds charm. In 2025, it’s still among the top blues, showing how family ties boost a diamond’s story.

11. The Graff Pink: $46.2 Million

This 24.78-carat fancy intense pink emerald cut sold for $46.2 million in 2010 to Laurence Graff, who recut it to 23.88 carats for vivid status. Type IIa and flawless – it’s rare.

Not seen for 60 years before sale, its pink is stunning. Graff’s touch made it even better. A classic in the most valuable diamonds list.

12. The Mediterranean Blue: A 2025 Newcomer at $21.5 Million

New to the market, this 10-carat fancy vivid blue was hammered for $21.5 million in May 2025 at Sotheby’s. Pear-shaped and vivacious, it’s a recent high, but not record-breaking.

Blues remain in demand, and this one’s clarity is bright. It indicates the market remains hot in 2025.

These diamonds aren’t only costly; they’re a piece of history. From the ancient mines to the present-day auctions, they tell us why diamonds are forever. When mines run out, look for prices to skyrocket. If you dream of having one, begin saving!

FAQs

What is the world’s most costly diamond?

The Kohinoor is most commonly thought to be the most costly because it is priceless, but for ones sold at auction, the Pink Star is the most costly at $71.2 million.

What is the current world record diamond price at auction?

The Pink Star established the world record diamond price at auction at $71.2 million in 2017 and retains this in 2025.

Why are coloured diamonds worth so much money?

Pink and blue colours are unusual, the result of special elements or pressure under formation, so they are rarer than colourless ones.

Where can I view these well-known diamonds?

Some, such as the Hope and Kohinoor, are in museums like the Smithsonian or Tower of London. Sold at auction, ones are normally in private collection sections.

Has any diamond sold for more in 2025?

No major records broken yet; the top 2025 sale was the Mediterranean Blue at $21.5 million, but classics still dominate.

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