Allochromatic gems are gems which have been coloured by impurities. Whenever they have been totally pure, they'd be colorless. The color of all allochromatic gems is made by defects. Therefore, all color in corundum is attributable to defects. What exactly is most abnormal is the fact this primary cost transfer https://apollobookmarks.com/story18037964/the-fact-about-sri-lanka-yellow-sapphire-that-no-one-is-suggesting