Rebounding from an over 3-month low, gold jumped Rs. 505, to Rs. 29,225 per ten gram at Delhi's bullion market on Saturday, on fresh buying by jewellers and retailers.Silver spurted Rs. 400, to Rs. 39,200 per kilo on increased offtake by industrial units and coin makers. Silver coins gained Rs. 1,000 to Rs. 67,000 for buying 100 pieces.