Allochromatic gems are gems that happen to be colored by impurities. Should they have been totally pure, they might be colorless. The colour of all allochromatic gems is produced by defects. Thus, all colour in corundum is caused by defects. Pukhraj stones are believed to become potent talismans that bring https://ledbookmark.com/story3599252/indicators-on-sri-lankan-yellow-sapphire-you-should-know