Nearly 6000-year-old stones used for making jewellery and hunting tools were found during the third phase of excavation in Vijayakarisalkulam.
It is located near Vembakottai in Tamil Nadu's Virudhunagar district.
Recently discovered jasper and sard stones were typically used in making ancient jewellery.
Over 2,800 artifacts, including gold and copper coins, broken terracotta figurines, chess pieces, glass beads and circular tokens, have been unearthed so far.