When gemstones are worn on the appropriate finger, the person experiences favourable outcomes. Stone recommendations are made according to your birth chart and zodiac sign, or Rashi, in Vedic astrology. The position of the Moon at the moment of your birth determines your original gemstone based on Rashi. In Hindu astrology, the stars and the ruling planet are taken into account while calculating stones based on Nakshatra. Astrology assigns meaning to gemstones based on their Rashi and Nakshatra.