The Oppenheimer Blue: The $57.5 Million Vivid Blue

In May 2016, at Christie's Magnificent Jewels sale in Geneva, the Oppenheimer Blue, a 14.62-carat fancy vivid blue diamond, sold for about US$57.5 million, premium-inclusive. The stone is named for Sir Philip Oppenheimer, the former chairman of De Beers, in whose family it had been.

At the very top, blue diamonds had detached from every other coloured-diamond category.

The result matters less as a number than as a ceiling. Fancy vivid blue is the top colour grade for blue diamonds, and 14.62 carats is a large stone in a category where most fine blues weigh under five carats. The combination put the Oppenheimer Blue in a class of its own, and the price confirmed what the trade already suspected: at the very top, blue diamonds had detached from every other coloured-diamond category.

The benchmark since

Every major blue diamond offered since has been measured against it. The 17.61-carat Bleu Royal, sold at Christie's Geneva in 2023 for US$39.5 million, and the 9.51-carat Mellon Blue, sold at the same rooms in 2025 for US$25.6 million, both fine stones with strong provenance, both sold for less. The Oppenheimer Blue's per-carat figure, roughly US$3.9 million, remains the number the market has not beaten.

Blue diamonds get their colour from boron, the same impurity behind the Hope Diamond's blue. What the Oppenheimer Blue proved is that the market prices that chemistry, at sufficient size and saturation, above almost everything else in the gem world.

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