Allochromatic gems are gems that are colored by impurities. Whenever they had been fully pure, they would be colorless. The colour of all allochromatic gems is produced by defects. Thus, all shade in corundum is brought on by defects. Beautiful piece of jewellery- properly created. Not way too flashy for https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share