Allochromatic gems are gems that are colored by impurities. If they were being wholly pure, they might be colorless. The colour of all allochromatic gems is produced by defects. So, all shade in corundum is because of defects. Marital Bliss: Donning a natural Pukhraj will improve marital bliss. In case https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share