Allochromatic gems are gems that happen to be colored by impurities. When they were absolutely pure, they'd be colorless. The color of all allochromatic gems is made by defects. Hence, all coloration in corundum is brought on by defects. Pukhraj stones are believed being strong talismans that bring good luck https://socialmphl.com/story19978497/how-much-you-need-to-expect-you-ll-pay-for-a-good-natural-pukhraj-from-sri-lanka