Engagement ring Set circa 1980s

14K, jewelry mark: circled letter B with a possible backwards letter F?

Greetings, my father purchased this vintage engagement ring set circa 1980s. Dad used to dabble a bit in gold as a hobby. mom placed the set in Storage approx. 1990 when they divorced. The gold is rather scuffed up but only worn 5-10 years. The set is very dirty, I am afraid to accidentally damage it if I were to clean it my apologies.