New Delhi, 20 July (NNS): The prices of big cardamom kainchicut gained by Rs 20 to Rs 1660 per kg because of the limited sale from the stockists at the higher level. Recently, the prices have gone up in the same ratio. The average auction price reported to be increase to Rs 1350/1762 per kg in the last auction which held on 16th July. The market sentiments may affect because of the heavy rainfall in the eastern parts of the country. There is no possibility of downfall in the spot big cardamom prices during the coming days.