Allochromatic gems are gems which might be colored by impurities. Whenever they were entirely pure, they might be colorless. The color of all allochromatic gems is produced by defects. Hence, all shade in corundum is because of defects. How to pick Greatest Yellow Sapphire? According to Vedic Astro professionals, the https://nybookmark.com/story19613742/indicators-on-sri-lankan-yellow-sapphire-you-should-know