Gold prices plunged by Rs 200 to Rs 29,420 per ten gram at the bullion market today in line with a weak trend overseas amid a fall in local demand. Silver followed suit and slipped below the Rs 39,000 level by tumbling Rs 825 to Rs 38,325 per kg due to reduced offtake by industrial units and coin makers. Traders said apart from a weak trend overseas, fall in demand from local jewellers and retailers at domestic spot market, mainly pulled down the prices.