Allochromatic gems are gems which might be colored by impurities. Should they were being fully pure, they would be colorless. The color of all allochromatic gems is produced by defects. Consequently, all shade in corundum is attributable to defects. How to pick Greatest Yellow Sapphire? According to Vedic Astro authorities, https://hubwebsites.com/story19365694/a-simple-key-for-natural-yellow-sapphire-from-sri-lanka-unveiled