Worship on Saturday with light blue flowers, incense to the Blue Sapphire and chant the following mantra 108 times: Aum Sham Shanaishcharaye Namah Aum or "Om Namo Bhagwate Vasudevaya" As crows are Shanis divine vahana, feeding crows will remove obstacles from life of native. Also, worshipping baby Krishna will provide peace and prosperity to the native. This is the fastest working gemstone in the constellation of gemstones. The planet that rules this gemstone is Lord Saturn God of Justice known to discipline people and balance the karmas by Shani Sade-sathi. The effect of this gemstone is visible even in 8 days or months for natives. If the wearer of gemstone gets pleasant dreams then the stone is lucky.