Ketu is sometimes called the "shadow" planet. Those natives who are in the positive influence of Ketu - reach great success and heights. But Ketu is can be malefic.So it is important to know if Ketu is benefic or malefic in a native's life. Cat's eye or Lahsuniya stone relieves mental strain, nervousness etc.Astrology consultation is important before wearing the stone. Each person has his/her unique birth chart, planets' positioning-placement.