Gold and silver prices rebounded sharply at the bullion market here today on hectic buying by stockists and speculators,triggered by a rally in the international market. Standard gold of 99.5 per cent purity spurted by Rs 635 to end at Rs 27,875 per 10 grams from Wednesday's closing level of Rs 27,240. Pure gold of 99.9 per cent purity jumped by Rs 640 to close at Rs 28,010 per 10 grams from Rs 27,370. Silver ready (.999 fineness) shot up by Rs 1,520 per kg to conclude at Rs 56,060 from Rs 54,540 previously. In overseas market,gold climbed on weaker dollar and fears of inflation after Federal Reserve pledged to hold US interest rates near zero until the end of 2014. In New York,gold for February delivery surged 26.60 to USD 1,726.70 an ounce on the Comex division of the NYMEX late yesterday. March silver contract gained 62 cents to USD 33.74 an ounce.