** Chow Tai Fook Jewellery Group HKEX:1929 slips 4.6% to HK$9.19; biggest pct loser on Hang Seng Index HSI:HSI
** HK-based jeweller's retail sales value falls 11.6% y/y in three months ended March 31
** Same-store sales slips 13.2% y/y in mainland China, 22.5% in Hong Kong and Macau in reported period
** Rivals Laopu Gold HKEX:6181 down 3.8%, Luk Fook HKEX:590 dips 1.7%; Lao Feng Xiang SSE:600612 adds 0.4%
** YTD, Chow Tai Fook stock gains 37.7%