A portion has been available online since last week, while nearly 100 pieces will be sold in person in Geneva on Wednesday and another 150 on Friday. The jewellery, including pieces from 20th-century designers such as Cartier, Bulgari and Van Cleef & Arpels, belonged to Heidi Horten who died last year aged 81, with a fortune of $2.9 billion, according to Forbes. Among the main attractions Wednesday will be the Sunrise Ruby, estimated at $15-20 million, Christie's said. The sale could eclipse previous records set by Christie's in sales of properties that belonged to actress Elizabeth Taylor in 2011 and...