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, coloured gemstones and jadeite 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 Boivin, Cartier, Harry Winston and Van Cleef & Arpels. Highlights are the Briolette of India, a 90cts briolette cut diamond, by Harry Winston, the Sunrise ruby, a 25cts Burmese ruby ring, by Cartier and the Art Deco Egyptian revival sautoir, by Van Cleef & Arpels.