Text size The late billionaire collector Heidi Horten’s jewelry, worth a total of US$150 million, will be auctioned across a series of sales at Christie’s starting in May. This will mark the most valuable jewelry collection to come to auction, surpassing the collections of Elizabeth Taylor and Qatar royal family member Sheikh Hamad Bin Abdullah Al Thani, Christie’s said. The Taylor collection, comprising 80 lots, sold for US$116 million at a Christie’s auction in December 2011 in New York. The sale of Al Thani’s collection, with nearly 400 pieces, achieved more than US$109 million at Christie’s, also in New York,...