Top 10 Most Expensive Diamonds in the World in 2025
The fascination with rare gemstones has captivated humanity for centuries. Among these, diamonds hold a special place as symbols of wealth, power, and beauty. In 2025, these ten diamonds have set themselves apart as the most expensive in the world, representing unparalleled craftsmanship, history, and value. Let us dive into the details of these extraordinary treasures.
1. The Koh-i-Noor Diamond – Priceless
The Koh-i-Noor Diamond, whose name means “Mountain of Light” in Persian, is widely regarded as one of the most valuable diamonds in the world. Its exact value is incalculable due to its historical significance and rarity. Currently part of the British Crown Jewels, this 105.6-carat diamond originated in India and has a storied history involving royalty and conquest.
This diamond’s unique cut and brilliance make it a standout piece, though its ownership remains a subject of international debate. The Koh-i-Noor continues to captivate collectors and historians alike.
2. The Cullinan Diamond – $2 Billion
The Cullinan Diamond is the largest gem-quality rough diamond ever discovered, weighing an astonishing 3,106 carats before it was cut. Found in South Africa in 1905, the diamond was later cut into nine major stones and numerous smaller pieces. Among these, the Cullinan I, also known as the “Great Star of Africa,” weighs 530.4 carats and is valued at over $400 million alone.
The Cullinan I and II are prominently featured in the British Crown Jewels, symbolizing the enduring allure of high-value diamonds.
3. The Hope Diamond – $350 Million
The Hope Diamond, a mesmerizing 45.52-carat blue diamond, is famed not only for its beauty but also for its alleged curse. This diamond’s deep blue hue is attributed to the presence of trace amounts of boron within its structure. Originally mined in India, the Hope Diamond has passed through numerous owners, including French royalty, before making its way to the Smithsonian Institution.
Its unique characteristics and storied past make it one of the most recognizable and valuable diamonds in the world today.
4. The Pink Star Diamond – $71.2 Million
The Pink Star Diamond, weighing 59.6 carats, holds the record for being the most expensive diamond ever sold at auction. This flawless pink diamond was sold for $71.2 million at a Sotheby’s auction in Hong Kong. Its vibrant color and exceptional clarity have made it a benchmark for pink diamonds.
The rarity of such a large, high-quality pink diamond has solidified its place on this list of the most expensive diamonds in the world.
5. The De Beers Centenary Diamond – $100 Million
The De Beers Centenary Diamond is a 273.85-carat gem that is renowned for its flawless D-color grade and exceptional clarity. Discovered in 1986 at the Premier Mine in South Africa, it was unveiled in 1988 to commemorate De Beers’ centenary celebration.
The diamond’s unique cutting process, which took over three years, and its extraordinary brilliance make it one of the most valuable diamonds ever discovered.
6. The Oppenheimer Blue Diamond – $57.5 Million
The Oppenheimer Blue Diamond, weighing 14.62 carats, holds the distinction of being the largest fancy vivid blue diamond ever sold at auction. This exquisite gemstone was sold for $57.5 million at a Christie’s auction in Geneva in 2016.
Its vibrant blue hue and association with the Oppenheimer family, who have been prominent figures in the diamond industry, contribute to its immense value and significance.
7. The Regent Diamond – $48 Million
The Regent Diamond, a 141-carat gem of Indian origin, is renowned for its exceptional whiteness and brilliance. It was once part of the French Crown Jewels and adorned the crown of Louis XV. Today, it is on display at the Louvre Museum in Paris.
The diamond’s history, coupled with its outstanding quality, makes it a timeless symbol of luxury and opulence.
8. The Wittelsbach-Graff Diamond – $80 Million
The Wittelsbach-Graff Diamond is a 31.06-carat fancy deep blue diamond with a storied past. Originally part of Austrian and Bavarian crown jewels, the diamond was recut by Laurence Graff in 2008 to enhance its brilliance.
The combination of its rich history and modern craftsmanship has elevated its value to approximately $80 million, solidifying its status among the world’s most expensive diamonds.
9. The Blue Moon Diamond – $48.4 Million
The Blue Moon Diamond, a 12.03-carat fancy vivid blue diamond, gained global attention when it was sold for $48.4 million at a Sotheby’s auction in Geneva. Its breathtaking color and flawless quality make it one of the most desired diamonds in the world.
Named after the rare celestial event, this diamond continues to captivate collectors and connoisseurs alike.
10. The Graff Pink Diamond – $46 Million
The Graff Pink Diamond, a 24.78-carat fancy intense pink diamond, was sold for $46 million at a Sotheby’s auction in 2010. Its rarity and stunning hue have made it a benchmark for pink diamonds globally.
The diamond was purchased by Laurence Graff, who described it as “the most fabulous diamond I’ve ever seen.”