A model wears a ring set with the Mellon Blue, a 9.51-carat Fancy Vivid Blue diamond graded Internally Flawless and estimated at $20-30 million, during an auction preview at Christie's in Geneva, Switzerland, November 7, 2025. — ReutersThe Mellon Blue, a 9.51-carat fancy vivid blue diamond...Rare 9.51-carat Mellon Blue diamond fetches $25.6 million at Christie's
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November 11, 2025
A model wears a ring set with the Mellon Blue, a 9.51-carat Fancy Vivid Blue diamond graded Internally Flawless and estimated at $20-30 million, during an auction preview at Christie's in Geneva, Switzerland, November 7, 2025. — ReutersThe Mellon Blue, a 9.51-carat fancy vivid blue diamond...
