Polish in a gemstone is just like that in the diamond. This means that the manufacturer aims to achieve the best possible glow and shine, given the hardness of the stone. A good polish will increase the ‘luster’ of the stone. The higher the luster, the better looking the stone is.
What we need to understand is that the stronger the stone, the better the polish and the subsequent luster, as softer stones do not polish as well. Most of the gemstones have a polish that falls under ‘vitreous’ range, in other words, it is glass-like.
Blue Sapphire is 9 on Mohs Scale of Hardness Allowing for a Beautiful Polish Luste
