Tri-Color Post Earrings

This very preexisting pattern has a gold outer color, silver (or white gold) color and the smallest triangle is copper. They measure 5/16th", so a little bigger than half an inch. I can't get the camera to focus on the one earring that has some pitting on the silver section - barely visible to the naked eye. These are about 40 years old; very elegant and were a gift from my husband. There is no stamp on the earrings so I don't know the metals.