Gold prices today jumped by 515 rupees to an eight-month high of 31,525 rupees per ten gram in Delhi. The biggest single day rise of gold price in two years was seen yesterday. The rally in gold prices sparked after rupee plunged to all-time low of 61.65 against dollar.The latest measures by RBI and the government are part of a series of steps taken to curb gold import.Silver price further shot up by 1,365 rupees to 50,685 rupees per kg on increased demand from industrial units and coin makers.