Allochromatic gems are gems which are colored by impurities. Whenever they have been entirely pure, they might be colorless. The color of all allochromatic gems is made by defects. Consequently, all coloration in corundum is because of defects. Sri Lanka’s Aggressive Edge Sri Lanka’s gem and jewellery value chain had https://socials360.com/story8362458/the-definitive-guide-to-natural-yellow-sapphire-from-sri-lanka