Hardness is one thing, Apart from many Some others, which differentiates sapphires from other gemstones. It can be next only to diamond and scores a nine outside of 10 to the hardness scale. Do sapphires are available in any other color Moreover blue? These gemstones, belonging for the corundum mineral https://socialmediatotal.com/story3326104/considerations-to-know-about-sri-lankan-yellow-sapphire