Jewellery and gemstones
Blue Mellon: an exceptional blue diamond at the heart of the gemstone market
The Mellon Blue is an exceptional blue diamond weighing 9.51 carats, graded Fancy Vivid Blue by the GIA and with flawless clarity, pear-cut and currently set in a ring. Its rarity and quality make it one of the most sought-after stones. It was offered at auction on 11 November 2025 at Christie's Magnificent Jewels sale in Geneva, with an estimate of between 20 and 30 million dollars.
