A Royal Trope: Napoleon’s Diamond Brooch Fetches CHF 2.85 Million at Sotheby’s Geneva By Patricia Holdener Geneva On 12 November 2025, at the annual “Royal & Noble Jewels” sale held by Sotheby’s at the Hôtel Mandarin Oriental in Geneva, a remarkable piece of jewellery with imperial provenance crossed the block: a diamond brooch reportedly once in the possession of Napoleon Bonaparte. The brooch realised a hammer price of CHF 2.85 million, and a final price in excess of CHF 3
