Allochromatic gems are gems that are colored by impurities. Should they ended up wholly pure, they'd be colorless. The colour of all allochromatic gems is produced by defects. So, all colour in corundum is due to defects. Sri Lanka’s Competitive Gain Sri Lanka’s gem and jewellery benefit chain were nurtured https://mysocialquiz.com/story3488293/new-step-by-step-map-for-natural-pukhraj-from-sri-lanka