LOS ANGELES — The emerald and diamond engagement ring that Howard Hughes gave to Hollywood star Katharine Hepburn in 1938 sold for US$108,000 at a Los Angeles auction – more than three times the expected price – while a collection of her love letters to him fetched $44,800.Auction house Profiles in History said on Friday that other personal items belonging to Hughes also went for more than their pre-sale estimates, including the entrepreneur’s trademark fedora (US$51,200) and the two-tone jacket