Womens Womens Iridescent Round cluster Silverstone Earrings vintage Jewelry

I don't know alot about Jewelry but I bought these at an estate sale about 15 or so years ago because I thought they were so pretty, never ended up wearing them but I'm sure someone did before I bought them. don't know what they're made out of. back is Silverstone color, front is iridescent color. fast shipping! thank you!