Allochromatic gems are gems which are coloured by impurities. If they have been entirely pure, they'd be colorless. The color of all allochromatic gems is made by defects. Hence, all color in corundum is because of defects. Right after lighting an incense adhere in front of the gemstone the mantra https://worldlistpro.com/story19814763/indicators-on-sri-lankan-yellow-sapphire-you-should-know