Beautiful blue and green gemstone ring 😍😍

Bought this as Sterling silver, but it is not marked. It's a size 7, too small for me, so it has been in my jewelry box for a couple of years. I bought another just like it in size 9, and have worn it off and on for over a year. It doesn't tarnish or turn finger weird colors and holds up fine to washing dishes, cleaning, etc. Love the colors of it, very pretty and could be mistaken for an expensive ring, all stones are prong set. Center is beautiful bright apple green. 😍