0.5Ct Simulated Brilliant 14K Yellow Gold 4mm Round Stud Screw Back EarringsOur CZ stud earrings are cut exactly like real diamonds with the same number of facets for optimal sparkle. They are super hard, just like the real thing, and no one will be able to tell the difference! Set in highly secure, 4 prong designer style mountings, these earrings feature screw on, screw off posts and backings. The radiance and fire of these CZs are equivalent to or superior to a natural diamond of VVS1 clarity, D color, and excellent cut.