A girl sits in a large inkstone in Wuyuan, Jiangxi province. Inkstones are considered one of the traditional "four treasures of study" and have continued gaining popularity among collectors.

A craftsman processes a Sizhou inkstone carving in a studio in Cengong county, Southwest China's Guizhou province, Nov 30, 2017. Sizhou inkstone, mostly produced in Cengong county, has a history ...