Allochromatic gems are gems which might be colored by impurities. Should they were completely pure, they would be colorless. The colour of all allochromatic gems is produced by defects. As a result, all color in corundum is due to defects. Therapy: Almost all gemstones are dealt with usually handled to https://bookmarkforest.com/story18003842/the-ultimate-guide-to-sri-lankan-yellow-sapphire-price-in-india