Emerald is the Gemstone of planet Mercury. Its ruling God is Lord Ganesha.
Before wearing an Emerald it should be immersed in Pure Desi Ghee on a Tuesday evening. It should be left there for at least 8 hours. After this on Wednesday morning it should be taken out from the Ghee and washed with Gangajal mixed with saffron.
Then wear this Emerald within 2 hours of sunrise after chanting Om! Braam Breem Broom Sah Budhai Namah 108 times.
Emerald should be worn in Right Hand Little finger or as a pendant. In certain cases it is also suggested to be worn as a waist band.