** Shares of Zhou Liu Fu Jewellery 6168.HK climb 6.4% to HK$20.4, post their biggest intraday pct rise since May 7
** The Chinese jewellery chain operator says its key shareholders LI Weizhu and LI Weipeng have undertaken of not to reduce shareholding in the company on expiry of a lock-up period of their shareholding in the company
** Zhou Liu Fu, with current market capitalsiation of $1.12 billion, says the key shareholders' undertaking to voluntarily extend the lock-up period will help the sustainable, steady and healthy development of the company
** YTD, stock down 31%, while the benchmark Hang Seng Index .HSI up 3.3%
($1 = 7.8321 Hong Kong dollars)
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))