Vintage gold tone ring with clear faceted stone size 4. Unmarked. Unknown maker. Prong set in a setting that is open on the sides, closed at the bottom. Unknown stone type. It could be cubic zirconium, glass, zircon, or some other material. Probably not a valuable gem. It is a very nicely cut stone, no matter what it's material. It is suspended in an open area in the center of the front of the ring.
The ring is very pretty, even if the stone is inexpensive material. You couldn't go wrong if you are looking for nice looking jewelry!