Beauties: vtg mother of pearl earrings & pendant, VGUC

Beautiful! Vintage unsigned set of silvertone and iridescent white mother of pearl screwback earrings and matching pendants, made into the shape of roses! The earring roses are just over 1/2" , the pendant rose is just over 1". There are a couple pink spots on the back of the earrings, I'm not sure if that's part of the natural material, or something else on it, or how to safely clean this material. Otherwise excellent, so overall Very Good Used Condition!