New Delhi, 12 July (NNS): Here, the prices of big cardamom Jhundiwali improved by Rs 710 per kg due to the increased sale even after the higher level. Recently, the prices have gone up by Rs 10/20 per kg. The average auction prices gained to Rs 525/830 per kg in the last auction which held on 6 July. There is no possibility of downtrend in the spot big cardamom prices during the coming days.