Explanation:

The people of Chalcolithic Age were expert coppersmiths, ivory carvers, lime makers, and terracotta artisans. (g) Ornaments were made from semiprecious stones and beads such as agate, jasper, chalcedony, and carnelian were used.

The Chalcolithic age produced a splendid civilisation in the Indus Valley, which spread in the neighbouring regions. The economy was based on subsistence agricultre, stock-raising, hunting and fishing. The tools consisted of specialised blades and flakes of silicious material like chalcedony and chert.