Allochromatic gems are gems that are colored by impurities. Whenever they had been fully pure, they'd be colorless. The color of all allochromatic gems is made by defects. Consequently, all colour in corundum is caused by defects. Noted for its clarity and shading uniformity, the Burmese Yellow Sapphire price in https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share