Allochromatic gems are gems which have been coloured by impurities. Should they were being absolutely pure, they'd be colorless. The colour of all allochromatic gems is produced by defects. Therefore, all color in corundum is caused by defects. As indicated previously, Together with the absorption cross part raise with concentration, https://bookmarkleader.com/story18108600/rumored-buzz-on-natural-pukhraj-from-sri-lanka