Allochromatic gems are gems which are coloured by impurities. Whenever they ended up entirely pure, they would be colorless. The colour of all allochromatic gems is produced by defects. Consequently, all colour in corundum is caused by defects. Sri Lanka’s Competitive Advantage Sri Lanka’s gem and jewellery benefit chain were https://tripsbookmarks.com/story18131143/top-guidelines-of-sri-lankan-yellow-sapphire