Allochromatic gems are gems which might be coloured by impurities. If they had been wholly pure, they'd be colorless. The colour of all allochromatic gems is made by defects. Hence, all shade in corundum is a result of defects. Clarity: Clarity is an additional noteworthy factor that refers to the https://ez-bookmarking.com/story18066704/how-much-you-need-to-expect-you-ll-pay-for-a-good-natural-pukhraj-from-sri-lanka