Allochromatic gems are gems which are coloured by impurities. When they were being wholly pure, they'd be colorless. The colour of all allochromatic gems is produced by defects. Therefore, all coloration in corundum is brought on by defects. Pretty bit of jewelry- properly made. Not much too flashy for daytime https://socials360.com/story8365701/the-best-side-of-sri-lankan-yellow-sapphire