Three sterling screw back earring sets

I cam across these earrings today, all of them are marked sterling. They came in with a lot of cocktail rings and a 1957(?) turquoise ring. The earrings measure .5", .75", 1" They are very, very sturdy and remind me of the Danish sterling brooches from the 1920's - 1950'w. This is the "before" picture. I will post a photo after I have polished them.