Though sapphire is hottest, and most respected, in its deep blue wide variety, the precious stone takes place in all colors except red, with which the gemstone will be named ruby. Corundum that may be even a shade much less red than ruby is immediately referred to as sapphire — https://crimson-treasures92356.tinyblogging.com/crimson-treasures-things-to-know-before-you-buy-70480648