Panna, Markat or Emerald is a variety of the mineral Beryl (Be3Al2(SiO3)6), which has been colored green by trace amounts of Chromium and sometimes Vanadium. Emeralds are known by their distinctive green color and can vary from light to dark green. All emeralds contain inclusions formed during their growth. Completely clear stones are extremely rare. Inclusions indicate that the stone is natural. The most common cut is the step or emerald cut. Emerald represents Mercury and when worn, increases intelligence, education, speech, teaching, learning, communication, confidence, writing ability, trade, humor, wit, discrimination, diplomacy, intellect and commerce. Budh or Mercury is the prince of the planetary cabinet. People with Gemini and Virgo ascendants are highly benefited by wearing a coral set in a gold ring. Astrong influence of Mars, Rahu and Saturn on Moon, Mercury and the fourth lord causes mental aberrations. In such cases one benefits from an emerald ring.