Copper and Quartz (I think, but I'm no expert - pretty earrings regardless and priced low in case I'm wrong) screwback vintage earrings
Pressed copper looking metal screwback earrings.
There is a marblized center that reminds me of quartz that has coppery gold flecks in it.
Each is about 7/8 inch high and 3/4 inch wide.
I see no identifying marks anywhere on these, but they sure seem to fit what Renoir was making in jewelry.
* I do not clean the items - I sell them in the same condition as I find them as I am not an expert.