Two men work with lapis lazuli stone at a factory in northwest Pakistan's Peshawar on April 17, 2017. (Xinhua/Muhammad Hadi)

A man polishes a lapis lazuli stone at a factory in northwest Pakistan's Peshawar on April 17, 2017. (Xinhua/Muhammad Hadi)

A man shows a lapis lazuli stone at a factory in northwest Pakistan's Peshawar on April 17, 2017. (Xinhua/Muhammad Hadi)