I really don't think they are sterling they just don't have the sparkle and color that sterling normally has. I will however be listing some silver tone and silver plated earrings of this same type that with hearts and hook backs that I can guarantee aren't sterling.
Great I'll list them tonight as a 3 day. I am allergic to anything that isn't sterling so I can't wear silver tone or silver plated, kinda glad to find the opposite of them although I know it sucks!