A spectacular blue diamond known as the Mellon Blue has captured global attention after selling for US$26.6 million at a prestigious auction in Geneva, Switzerland. The remarkable sale occurred on November 11, 2025, at Christie's, one of the world's leading auction houses.
The Prized Gemstone
The Mellon Blue is a fancy vivid blue pear-shaped diamond weighing 9.51 carats, making it an exceptionally rare find in the world of precious gems. Before the auction, Christie's had estimated the diamond would fetch between US$20 million and US$30 million, placing the final sale price squarely within their predicted range.
Leading up to the highly anticipated sale, Christie's Geneva hosted a preview event on Friday, November 7, 2025, where the magnificent diamond was displayed to potential buyers and media. The preview generated significant interest among international collectors and diamond connoisseurs.
Auction Details and Significance
The successful sale demonstrates the continued strength of the high-end jewelry market, particularly for exceptional colored diamonds. Blue diamonds remain among the most sought-after and valuable gemstones in the world, with their rarity and intense coloration driving intense bidding competition.
The pear-shaped cut of the Mellon Blue enhances its brilliance and showcases the diamond's remarkable color saturation. This particular shade of vivid blue is exceptionally rare in nature, occurring in only a tiny fraction of diamonds mined worldwide.
Market Impact and Collector Interest
The substantial price achieved at the Christie's auction underscores the enduring appeal of investment-grade diamonds among wealthy collectors. Despite global economic fluctuations, the market for exceptional gemstones continues to show resilience, with blue diamonds consistently performing well at auction.
The sale price of US$26.6 million represents one of the most significant diamond transactions of the year and sets a benchmark for similar gemstones coming to market. The successful auction demonstrates that exceptional quality diamonds continue to represent both aesthetic beauty and solid investment value in the luxury collectibles market.
