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Blue Sapphire is a precious gem stone from the mineral called corrundam.The chemical formula is Al2O3(Aluminium Oxide).Blue sapphire is also called as "Neelam" and "Shani priya".This is believed that the stone is ruled by the planet Saturn.The stone is famous for its silky lustre and beautiful blue color varieties.The famous source of blue sapphire is Australia,Srilanka,Madagascar,
Afghanistan,India and USA.