GENEVA—The 700-piece private jewelry collection of the late Austrian billionaire Heidi Horten, the world’s largest and most valuable collection of its kind to come to auction, could sell for more than $150 million, Christie’s said on Monday.
Some of its most spectacular pieces include the 90-carat “Briolette of India” diamond necklace by Harry Winston, and the “Sunrise Ruby” and diamond ring by Cartier that is worth up to an estimated $20 million.
