Christie’s Magnificent Jewels auction in Geneva on 15th May 2019 offered a superb selection of pieces, many of which, including a Russian Imperial Emerald, achieved well over their estimates. The Imperial Emerald of Grand Duchess Vladimir of Russia is a pear-shaped emerald of 75.61 carats, with pear, circular and marquise-cut diamonds on a necklace of platinum and gold. On an estimate of CHF 2,300,000 – CHF 3,500,000 (£1.8m-£2.7m) it realised CHF 4,335,000 (£3.4m). The second...