Most Expensive Diamonds by Price and Auction Records
The most expensive diamonds are defined by auction hammer prices, private sale records, and per-carat valuations tracked by major auction houses and market analysts. The Pink Star, a 59.60-carat vivid pink diamond, sold at Sotheby's Hong Kong in 2017 for $71.2 million, setting a per-carat record for any gemstone at the time, while the Oppenheimer Blue, a 14.62-carat fancy vivid blue diamond, sold at Christie's Geneva in 2016 for $57.5 million, reflecting sustained demand for large fancy colored stones from institutional and private collectors Forbes.
In 2024, the market continued to see multi-million-dollar transactions for exceptional stones, with auction results from Sotheby's and Christie's showing that diamonds above 10 carats with top color and clarity grades consistently achieve price premiums over comparable polished stones. The Lulo Rose, a 5.11-carat fancy vivid pink diamond, sold at Christie's Geneva in 2023 for $26.6 million, and the Winston Blue, a 13.22-carat fancy vivid blue diamond, sold at Christie's Geneva in 2014 for $23.8 million, illustrating how color intensity and size drive value more than clarity alone Christie's.
Top Auction Houses and Companies Selling the Most Expensive Diamonds
Sotheby's and Christie's remain the primary venues for record-setting diamond sales, with both houses reporting consistent growth in high-value lots over recent years. Sotheby's Magnificent Jewels sales regularly feature stones valued above $10 million, while Christie's Geneva and New York sales have repeatedly set per-carat records for pink, blue, and red diamonds, reinforcing the role of these auction houses in price discovery for the ultra-high-net-worth segment Sotheby's.
Private dealers and specialized brokers also facilitate sales of the most expensive diamonds outside public auctions, with companies such as Graff Diamonds and De Beers handling stones valued in the tens of millions. Graff has acquired and sold multiple record-breaking diamonds, including the De Beers Millennium Star, a 203.04-carat colorless diamond, while De Beers' Central Selling Organisation continues to control a significant share of global rough diamond supply, influencing the availability and pricing of large, high-quality stones De Beers.
What Makes Diamonds Expensive: Key Factors and Market Drivers
The price of the most expensive diamonds is driven by the 4Cs, with color, clarity, cut, and carat weight interacting to determine value, but for record-setting stones, color and size are the dominant factors. Fancy vivid pink, blue, and red diamonds are exceptionally rare, with only a handful of stones over 10 carats appearing at auction each year, and the Argyle mine closure in 2020 has tightened supply of pink diamonds, supporting long-term price appreciation for these rare colors Argyle Pink Diamond.
Market data from the Rapaport Diamond Report and industry analyses show that per-carat prices for top-color diamonds