Sapphire: the blue gem sacred to saturn
Do you know the history of the sapphire? Sapphire is a precious stone belonging to the corundum family, it is composed of highly allochromatic aluminum oxide (Al2O3) crystals. As for its hardness, it is one of the hardest gems, in fact it has 9 on the Mohs scale. Its name derives from the Latin “sappheiros”,…