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

The 9.51-carat Fancy Vivid Blue diamond sold within its $20-$30 million estimate, reflecting steady collector demand despite a cautious market, auctioneer said.

  • 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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Lean Left

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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Lean Left

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.

The "Mellon Blue" diamond is set in a snake-shaped ring and has 9.51 carats. A Chinese collector can now enjoy a sum of millions. However, the buyer of the diamond ring is not known.

·Frankfurt, Germany
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Center

The stone belonged for decades to Rachel Lambert Mellon, better known as "Bunny" Lambert Mellon (1910-2014), gardener, philanthropist and American art collector

Right

The value of this diamond was estimated by the auction house to be between 20 and 30 million dollars.

ledauphine.comledauphine.com
+3 Reposted by 3 other sources
Center

This diamond "of exceptional purity" has long belonged to "Bunny" Lambert Mellon, known for renovating the Roseraie de la Maison Blanche in 1961.

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Quotidiano Nazionale broke the news in Italy on Tuesday, November 11, 2025.
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