Gold tumbled 350 rupees, to 27,450 rupees per ten grams at Delhi's bullion market, on Monday, on fall of demand after the end of festive season and a weak global trend. Silver lost 35 rupees, to 38,200 rupees per kilo on reduced off take by industrial units and coin makers. Silver coins plummeted 2,000 rupees, to 66,000 rupees for buying 100 pieces.In international market, gold in Singapore lost 0.3 percent, to 1,227.5 dollars an ounce.