Allochromatic gems are gems that are colored by impurities. When they had been absolutely pure, they might be colorless. The color of all allochromatic gems is made by defects. Thus, all shade in corundum is brought on by defects. The Srilankan Yellow Sapphire gemstone escalates the comprehension and harmony in https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share