Auction introduction: The High Jewelry sale held in Geneva this past May achieved exceptional results, with 97% of the lots successfully sold. A highlight of the auction was the sale of the Mediterranean Blue diamond, an extraordinary 10.03-carat fancy vivid blue diamond, which realised CHF 17.9 million (US$ 21.5 million), marking it as the most valuable diamond sold at auction thus far in 2025. Following this notable success, Sotheby’s is honoured to present its upcoming High Jewelry sale, scheduled for 12th November. This highly anticipated event will offer a distinguished selection of masterpieces from the world’s most esteemed jewellery houses, including Cartier and Van Cleef & Arpels, alongside a superb array of coloured gemstones and exceptional diamonds. We are currently accepting consignments for and invite you to contact our experts to receive a free and confidential valuation, to do so please visit Sell with Sotheby's or contact a member of the Jewellery Department.