This is a gorgeous 3-stone 18k solid gold ring. The design is an interpretation of Balinese work with detailed granulation and double rows of twisted wire.
The center stone is a beautiful deep blue piece of Peruvian blue opal. This material is nearly impossible to come by these days and to find a darker deeply saturated piece like this even more rare (see link below for more info). The accent stones are triangles of peridot.
The ring at its widest point is approx. 1/2” wide (at the front) and the band tapers to approx. 1/4” at the back. This is considered a wide-band ring so you might consider sizing based on rings you wear that are comparable.
Learn more about Peruvian Blue Opal at this link.