Pukhraj or yellow sapphire has a very special place in Vedic astrology and is considered the representative of the planet Guru or Jupiter which is the largest graha or planet in the solar system.
Jupiter is considered an auspicious planet and is related to wisdom, knowledge, good fortune, wealth, power and status. If Jupiter is well-placed in your horoscope then chances are that you will be enabled to enjoy all the good things in life. However, if Jupiter is a bad or weak position, it can have the opposite effect. It is often recommended that people wear yellow sapphire to increase the beneficial effects of Jupiter or negate the tribulations caused by a poorly-placed Jupiter. Especially for people born under the signs of Sagittarius or Pisces a yellow sapphire is considered very beneficial.