Mellon Blue Diamond Sells for $25.6 Million at Christie’s Auction

The Mellon Blue diamond, a 9.51-carat fancy vivid blue diamond, was sold for $25.6 million at Christie’s Magnificent Jewels auction held at the Four Seasons Hotel des Bergues in Geneva on November 11, 2025. This price, which includes buyer's premiums, is approximately 22 percent lower than its previous sale price of $32.6 million in 2014, when it was auctioned as part of the estate of its former owner, Rachel Lambert “Bunny” Mellon. Adjusted for inflation, the 2014 sale would equate to about $44.7 million in 2025.

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Rachel Lambert Mellon, who passed away in 2014 at the age of 103, was a prominent American art collector and philanthropist. The diamond, which was set in a serpentine ring, is noted for its exceptional quality, being graded as internally flawless by the Gemological Institute of America. The Mellon Blue has become emblematic of a bygone era, reflecting the opulence associated with Gilded Age fortunes.

Mellon Blue diamond sells for US$25.6 million

The sale of the Mellon Blue diamond has been interpreted by some experts as indicative of broader market conditions. Tobias Kormind, managing director of 77 Diamonds, remarked that geopolitical tensions, including the war in Ukraine and economic challenges in China, contributed to a cautious atmosphere among bidders. He noted that the sale did not meet expectations, suggesting that these factors may have influenced the lower final price.

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Max Fawcett, head of jewelry at Christie’s Geneva, described the diamond as “an outstanding stone” and highlighted its rarity and historical significance. He emphasized that the sale reaffirmed the enduring allure of rare colored diamonds, which are valued both as artistic treasures and stable investments.

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Rahul Kadakia, president of Christie’s Asia Pacific and chairman of the global luxury group, stated, “It was a true honour to offer for sale the exquisite Mellon Blue Diamond here at Christie’s Geneva. It was another notable moment for Christie’s Luxury, evidencing the elite appetite amongst collectors for extraordinary and storied gems.”

Rare ‘Mellon Blue’ Diamond Sells for $25.5 M. at Christie’s

Despite the successful sale, some industry observers expressed disappointment. Kormind noted, “Not the dazzling moment I expected,” reflecting a sentiment that the auction did not live up to the hype surrounding the diamond. This cautious approach among collectors may have implications for future auctions, as the market navigates ongoing economic uncertainties.

Mellon Blue Diamond Sells For $25.6 Million At Geneva Auction

Following the Christie’s auction, Sotheby’s is set to hold its own jewelry sale in Geneva, featuring notable pieces such as the “Glowing Rose” pink diamond, expected to fetch around $20 million. This upcoming auction will further test the appetite of collectors in the current market climate.

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• “It has also become symbolic of a lifestyle of a bygone era, the type only possible with a Gilded Age fortune.” — Max Fawcett, Head of Jewellery at Christie’s Geneva

Mellon Blue Diamond Sells For $25.6 Million At Geneva Auction

• “Not the dazzling moment I expected,” — Tobias Kormind, Managing Director of 77 Diamonds

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• “It was a true honour to offer for sale the exquisite Mellon Blue Diamond here at Christie’s Geneva. It was another notable moment for Christie’s Luxury, evidencing the elite appetite amongst collectors for extraordinary and storied gems.” — Rahul Kadakia, President of Christie’s Asia Pacific

Rare ‘Mellon Blue’ Diamond Sells for $25.5 M. at Christie’s