Rough cut emerald ring . 
 Wearing : Right hand ring finger
 Clean : with ganga jal round up 11 time with incense.
Mantra : Om Braang Breeng Broung Sah Budhay Namah 108 times
 

Benefits:
If Mercury is giving good results according to your horoscope, you should wear Emerald. Mind works properly by wearing an Emerald and can get the benefits in study, business and writings. It also bring good fortune, wealth and prosperity.