When sapphire is hottest, and most useful, in its deep blue variety, the precious stone occurs in all shades apart from purple, with which the gemstone would be referred to as ruby. Corundum that's even a shade a lot less purple than ruby is quickly termed sapphire — pink sapphire. https://diabetes-type-257902.blogs-service.com/57700195/5-simple-techniques-for-gemstones