Most Valuable Diamonds by Sale Price and Auction Records
The most expensive diamonds are defined by verified auction prices and private sale records tracked by major auction houses and industry reports. The Pink Star, a 59.60-carat vivid pink diamond, sold at Sotheby's Hong Kong in 2017 for $71.2 million, making it the highest price per carat ever recorded for a gem diamond at the time. The Oppenheimer Blue, a 14.62-carat fancy vivid blue diamond, set a per-carat record when Christie's Geneva sold it in 2016 for $57.5 million. These sales are documented by auction houses and financial news outlets such as Forbes, which regularly reports on record-breaking gemstone transactions record-breaking gemstone transactions.
In 2024, the market for colored diamonds continued to show strong price growth, with rare pink, blue, and red stones commanding premiums far above comparable white diamonds. The Lulo Rose, a 5.11-carat fancy vivid pink diamond discovered in Angola, sold at Christie's Geneva in 2023 for $26.6 million, highlighting the rising importance of African-sourced colored stones. Industry analysts use price-per-carat indices and auction databases to rank diamonds, with the largest and most saturated colored stones consistently occupying the top positions in global value rankings most expensive diamonds in the world.
Largest and Most Famous Diamonds in History
Top 10 Most Valuable Diamonds by Carat Weight and Clarity
The Cullinan Diamond, unearthed in South Africa in 1905, remains the largest gem-quality rough diamond ever found at 3,106.75 carats. It was cut into several stones, including the Great Star of Africa, which is mounted in the British Royal Scepter and is valued as part of the Crown Jewels. The Lesedi La Rona, a 1,109-carat rough stone discovered in Botswana in 2015, was sold by Lucara Diamond Corp. and cut into the Lesedi La Rona polished diamond, which sold at Sotheby's in 2023 for $53 million.
Other historically significant stones include the Koh-i-Noor, a 105.6-carat diamond set in the British Crown Jewels, and the Hope Diamond, a 45.52-carat deep blue diamond housed at the Smithsonian Institution. While these stones are not sold on the open market, their insured values and cultural significance place them among the most valuable diamonds in the world. Gemological institutes such as the Gemological Institute of America provide certification data that underpins these valuations certification data.
Companies and Markets Driving Diamond Value
Major Producers and Auction Houses
Lucara Diamond Corp., De Beers Group, and Alrosa remain the primary producers of large, high-value rough diamonds. Lucara's Karowe Mine in Botswana has produced multiple record-breaking stones, including the 1,174-carat Sewelô and the 813-carat Constellation, both of which were sold through high-profile auctions. De Beers operates the Diamond Trading Company and controls a significant share of the global rough diamond supply, influencing pricing through its sightholder system.
Investment and Certification Standards
Investors increasingly treat rare diamonds as an alternative asset class, with