Chris: 8mm 4.0ct Brilliant-cut Black Ice CZ Screw Back Stud Earrings 925 Silver, 0997 Hard-to-find threaded posts with screw-on backs! Our Black Ice CZ work equally well as a solitaire accent to your evening attire and they make an excellent choice for accenting, stacking or stepping in multiple piercings. Made with solid 925 Sterling Silver