As the name suggests, an original moonstone is ruled by the planet Moon aka Chandra dev. Hence it is also known by the name Chandrakantmani or Chandramani. As per the expert astrologer, wearing this gem will remove the negative effects of the Moon, if it is situated in an unfavourable position in your birth chart. It will bring you blessings and positivity instead.
It is also the best substitute for pearls. Hence, if you are not able to wear a Pearl, it is the best alternative.