Blue sapphire is a compound of aluminum and oxygen. Due to slight mixture with cobalt it becomes blue. Blue sapphire found in Ceylon is the best, deep light coloured and transparent. Blue sapphire of deep colour and transparence is found in Thailand and Australia.

Blue sapphire/Neelam shows its effects sooner than any other gem. It is proved fruitful or effective to the wearer, it will destroy his diseases, faults, sorrows, poverty and increases his food grains, prosperity, strength, glory, life-span and off-springs. It also restores the property which the wearer might have lost prior to the wearing of the blue sapphire. If it is proved unfavorable, it may make all the efforts, activities fruitless and may destroy every thing of the wearer.

Blue sapphire is most useful especially to the transporters, property dealers, contractors, mill owners, dealers in machines, laborers, hawkers, policemen, workers of local self-government and financers. It is also said that it can give peace to the heart of the man if it is worn near the heart. According to a Buddhist monk evil thoughts are destroyed and mind as well as behavior remains pacified by wearing blue sapphire. Morality remains firm in ladies who wear blue sapphire. It should be taken off, if its colour is changed or it is cracked because this is a warning to the wearer that he should change his gem.