Auction introduction: The World of Heidi Horten, a spectacular single-owner Jewellery Collection, offered at the Four Seasons Hotel des Bergues in Geneva over a series of auctions in May and November. Spanning from the 1970s to the current day, the collection not only comprises some of the world’s most precious diamonds and coloured gemstones but also includes the most exceptional curation of Bulgari jewels to have ever appeared at auction. The sale also represents exceptional jewels by other famous Jewellery houses such as Cartier, Harry Winston, Marina B and Van Cleef & Arpels. Highlights include the Great Moghul carved emerald necklace by Harry Winston of 362 carats, a sensational rectangular-shaped diamond ring of 47cts and an elegant yellow diamond bracelet by Tiffany & Co.