Rock Couture Collection 9ct Yellow Gold Stud Earrings With A Round Ball Shape. Easy to wear for all occasions, discreet yet elegant, these studs are a must. Polished and spherical, they will just blend in with any style. Post and butterfly fitting. Mix them with a pair of hoop earrings from our Rock Couture Collection to create your own unique layering look. Approximately 5x5mm.