New Delhi, 03 July (NNS): The prices of big cardamom kainchicut remained firm at Rs 1640 per kg because of the weak offtake at the improved prices. Recently, the prices have gone up by Rs 10 per kg. The average auction price reported to be at Rs 1350/1725 per kg in the last auction which held during the previous day, due to this, the market sentiments may affect. There is no fear of downfall in the spot big cardamom prices during the coming days.