Allochromatic gems are gems that are colored by impurities. When they have been totally pure, they might be colorless. The color of all allochromatic gems is made by defects. Therefore, all color in corundum is because of defects. Natural Pukhraj is usually a hugely coveted and worthwhile gemstone, finest for https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share