New Delhi, 29 June (NNS): The Meteorological department, has predicted heavy rainfall in all the famous producing areas like Assam, Meghalaya and West Bengal, due to this, the supply gets affected, in this situation, here, the prices of big cardamom kainchicut gained by Rs 30 to Rs 1630 per kg. Recently, the prices have gone down by Rs 20 per kg. The average auction price rose to Rs 1350/1700 per kg in the last auction which held on 25^th June, due to this, the market sentiments may affect. There is no possibility of long downfall in the prices during the coming days.