In Hindu astrology, emerald is associated with the planet Mercury, the ruler of the zodiacs Gemini and Virgo. The stone may exhibit secondary shades of yellow and blue as well. Properties: Donning an emerald (panna) is said to bestow its wearer with great intellectual capabilities. This gemstone helps in increasing your oratorical skills and concentration. It is a commonly suggested remedy for chronic digestive ailments as well. People in the creative industry and sportsmen are commonly asked to don the emerald.