Mumbai, May 13 -- The government on Wednesday hiked import duties on gold and silver to 15 per cent from 6 per cent as part of measures to curb inbound shipments of precious metals amid a rising import bill due to the West Asia crisis, the finance ministry notified. The revised rates came into effect on 13 May. Days after Prime Minister Narendra Modi's clarion call for curbs on gold purchases, along with other austerity measures to save on foreign exchange, the Finance Ministry, in a notification, hiked the social welfare surcharge (SWS) and the agriculture infrastructure and development cess (AIDC), effective May 13. The duty hikes will raise the overall customs duty on gold to 15 per cent. Separately, the Finance Ministry also revised c...