A worker from Sichuan cuts a huge slab of stone into blocks in the southern Chinese city of Huizhou in Guangdong province in this March 9, 2009 file photo. The drilling of gems produces a haze of fine silica dust that workers inevitably inhale if they do not wear protective gear. These workers can develop silicosis years later, an incurable disease that can lead to complications like tuberculosis or heart attack. Picture taken March 9, 2009. To match feature GEMSTONES LUNGS/ REUTERS/Bobby Yip/Files (CHINA HEALTH SOCIETY BUSINESS)
REUTERS/Bobby Yip