Vintage Rare Women's 70s Black Onyx Dome Ring and 14k Gold Thread

This elegant women's ring features a striking black onyx dome style design with 14k gold accents, perfect for adding a touch of sophistication to any outfit. size 6-1/2 no hallmarks there is 1 gold thread missing from one side (see photos) otherwise in excellent vintage condition circa 1970's I remember my Mom wearing this when I was a kid back in the 70's. Thiswas a fancy ring back then, lol