Allochromatic gems are gems which have been coloured by impurities. Whenever they were being absolutely pure, they might be colorless. The color of all allochromatic gems is made by defects. Hence, all colour in corundum is due to defects. Therapeutic Added benefits: The stone also offers many healing benefits to https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share