If you want to wear an Emerald Gemstone, you can wear a 3 to 6 carats Emerald. Light green color will give best results according to my experience. Make in gold or silver ring and wear it in the morning of any Wednesday during Shukla Paksha, wear it in the last finger. For Purification and activate the gemstone , dip the ring in milk, honey and pure water, for 20 to 30 minutes, Burn 5 incense sticks to Name of Buddha Deva and pray that you are going to wear the representative gemstone Emerald to have Blessings from Buddha Deva. Then take out the ring from the pure water and round it up the incense sticks 21 times while speaking the mantra ॐ बू बुद्धाय नम: after the mantra you can wear it in your little finger. Emerald will give effects within 45 days .