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Blue sapphire is a precious gemstone, a variety of the mineral corundum, known for its deep blue color from iron and titanium. Highly durable with a hardness of 9 on the Mohs scale, it's September's birthstone and symbolizes royalty, wisdom, and loyalty. Astrologically, it's associated with Saturn and believed to bring instant wealth, fame, success, and mental clarity, though it can have strong effects.