This is a 3-stone 18k solid gold ring. The design is an interpretation of ancient Etruscan styles with highly detailed band. The center stone is Caribbean blue gem silica from a mine in Mexico that has closed long ago. I find pieces of this material from time to time in collections and incorporate it into pieces like this that are truly one of a kind. The side stones are forest green Tsavorite.
The ring at its widest point is approx. 3/8” wide and the band is approx. ¼” at the back (see photo with older U.S. dime for size/scale). It is a medium weight ring weighing nearly 8 grams.