VTG from 70’s dainty black onyx post earrings 1/2 inch diamond/crystal above stn

Pre-owned Vintage 70’s black onyx diamond chip pair of post earrings. I received from my Parents as Christmas gift in early 70’s. Gold plated base material. I am not seeing any marks on back, well I can’t see- let’s put it politely. 1/2 inch length.