Clarity on issue of Riba is so important in Shari’ah that while recognizing change in value due to change in quality, it does not force us to exchange different qualities in equal quantity and yet in case of Amwale Ribuwiah, it does not allow these to be directly exchanged with any excess of weight (quantity) on either side. As generally understood by our scholars, this restriction was essential to stop practice of Riba by hiding behind difference in quality.