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‘Mellon Blue’ diamond sells for $25.6 million at Swiss auction

The Mellon Blue diamond, graded Fancy Vivid Blue and Internally Flawless, sold within its $20-$30 million estimate, reflecting strong collector demand for rare colored gems.

  • The 'Mellon Blue' diamond, a 9.51-carat pear-shaped blue diamond, sold for $25.6 million at a Christie's auction in Switzerland on Tuesday.
  • Christie's says the final price includes the buyer's premium and other fees, and the stone was expected to fetch $20-$30 million.
  • The 'Mellon Blue' diamond was previously owned by the late American arts patron Rachel 'Bunny' Mellon, and it was part of her private collection for decades.
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A nearly 10-carat stone named after a late American gardener has been sold at an auction in Geneva.

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This bright blue diamond "is one of the most beautiful colored diamonds ever offered for auction" according to the famous sales house Christies.

·Paris, France
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A 9.51-carat diamond from an intense white man who was held by American art collector Bunny Mellon was sold at $25.6 million under a bid made on March...

·Romania
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The stone belonged for decades to Rachel Lambert Mellon, notably known for renovating the White House rose garden in 1961 at the request of President John F. Kennedy.

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France24 broke the news in France on Tuesday, November 11, 2025.
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