Shares of Chow Tai Fook Jewellery (1929.HKG) and New China Life Insurance (1336.HKG) fell in their trading debuts on the Hong Kong Stock Exchange Thursday, a sign of continuing volatility and weak sentiment in the market, The Wall Street Journal reported. Shares of Chow Tai Fook, a jeweler that generates most of its revenue in mainland China, fell 8% during the trading day to close at HK$13.80 (US$1.77), while shares of New China Life, the country’s fourth-largest life insurer, fell 9.8% to close at HK$25.70 (US$3.30). Guodian Technology & Environment Group, which installs energy-savings facilities for coal-fired power plants, also said it would halve the size of its Hong Kong IPO, which it expected to raise up to US$646 million, according to a person familiar with the situation.