Change the color of a picture -Photoshop

i want you to change the color of the picture. i want only the 3 stones change to green color. the stones you will change color is the 3 center stones. if you see the attached photo you will understand what i mean. the color i want is the emerald color ,you can see the color at [login to view URL] you can make samples and show to me. i need a clean and quality integration. regards important note: very small project lowest bids welcome.