Allochromatic gems are gems that are colored by impurities. If they were being totally pure, they might be colorless. The color of all allochromatic gems is produced by defects. Thus, all shade in corundum is because of defects. Certification: The presence of a credible gemological certification from a trustworthy and https://socialimarketing.com/story3523703/the-ultimate-guide-to-natural-pukhraj-from-sri-lanka