(Moonga or Pravalam or Pagadam): Mars Emerald (Marakatam or Panna or Pachcha): Mercury Yellow sapphire (Pushyaragam): Jupiter Diamond (Hira or Vajram): Venus Blue sapphire (Indra-neelam): Saturn Hessonite (Gomedhikam): Rahu , the ascending lunar node Cat's eye (Vaiduryam): Ketu , the descending lunar node Based on an individual's Sidereal horoscope , either