Sterling Silver 925 Purple and Clear Stone Dangle Earrings

Sterling Silver 925 Purple and Clear Stone Dangle Earrings. These are marked 925 on posts. I’m not sure is the stones are anything good but these earrings are so beautiful! They have been worn only a couple times but I’ve had them in my jewelry box a long time so they show all over wear. They would be great to wear at a formal function! Measurements are approximate and colors may be off because of lighting. Since these aren’t new and have been used there may be imperfections. I’m unsure if the backs are the original backs and if they match each other. I’m also unsure if the backs are Sterling or not. The backs seem darker than the rest of the earrings that’s why I’m unsure if they are original or if they are Sterling or not.