Gold spurted 575 rupees, to 30,775 rupees per ten grams at Delhi's bullion market, on Monday, on increased buying by retail customers for the ongoing marriage and festival season, amid a firm global trend. Silver advanced 680 rupees, to 47,570 rupees per kilo, on emergence of buying by industrial units and coin-manufacturers. Overseas, gold rose 0.4 per cent, to 1,277 dollars an ounce. Silver added 0.1 per cent, to 21.35 dollars an ounce.