Mellon Blue Diamond Sells for $25.5 Million at Christie’s Geneva Auction
A spectacular 9.51-carat Fancy Vivid Blue diamond known as the “Mellon Blue” has sold for $25.5 million (CHF 20.5 million) at Christie’s Magnificent Jewels auction in Geneva on November 11, 2025. The sale, which fell within the pre-auction estimate of $20–30 million, attracted significant attention from collectors worldwide despite a cautious market climate. The pear-shaped […]
Mellon Blue Diamond Sells for $25.5 Million at Christie’s Geneva Auction Read More »









