** Shares of Chow Tai Fook Jewellery Group 1929.HK fall 7.8% to HK$14.05, their lowest level since Nov 10
** Stock set for the biggest one-day pct drop since Nov 3, on track to snap two straight sessions of gain; top pct loser in benchmark Hang Seng Index .HSI, which is up 0.3%
** The Hong Kong-based jewellery chain operator said its revenue for six months ended in September slipped 1.1% y/y, gross profit margin eased to 30.5%, from 31.4% a year ago, while net profit was up 0.1% y/y
** Stocks of rivals climb with Laopu Gold 6181.HK up 1.7% and Luk Fook Holdings 0590.HK gaining 1.3%
** YTD, Chow Tai Fook shares up 112.6%, Hang Seng Consumption Index .HSCGSI up 10.6%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))