Emerald Gem, aka Panna Ratna, is considered as a highly auspicious stone in western as well as Vedic astrology. While western astrology assigns it as the birthstone of may month and is best recommended for individuals born in the month of may; as per Indian astrology, it belongs to the planet mercury or Guru Bhraspati and is worn to gain the right path, good health, and professional prosperity. This beautiful green crystal belongs to the Beryl gem mineral clan and holds a hardness of 7.5-8 on the Mohs scale. Buy Certified Emerald gemstones from Navratan, the online gem Bazar.