In astrology, unheated sapphire is preferred based on the simple fact that it is not treated or heated in any way. Such sapphires are said to be pure planetary sapphires and are very beneficial for astrological purposes to satiate the effect of Saturn (Shani). It is believed that just like any other colored sapphire, unheated blue sapphire can help in warding off the ill effects of SHANI and it aids in combating the tough phases like Sade Sati, in enhancing relationship and career prospects. Heated sapphires have a technique to improve color and clarity, but during the process of heating, the stone loses its vibrations. The difference between heated and unheated sapphire is that energy in unheated sapphire is much more potent than that in heated sapphire; therefore, for astrological reasons the former is more applicable, and hence, better for use in spirituality.
