@tvenkatesh,
Instead of emerald you can go for semi-precious gemstone Green Tourmaline of 5 carats (excpet 3 carats). Wear it on your right hand little finger on auspcious day. Come back when you purchase the gemstone for knowing auspcious muhurtham based on your natal chart.
And Rudraksh should be wornmost of the time as you Moon is weak. And as you are a non-vegetarian you should not wear Rudraksh during eating non-vegetarian foods.
And please follow the rules strictly after wearing the gemstones.
GOD BLESS!!!
Srinivasa Temkar