Lots of sparkle are produced by a magnificent black round circle shape cz cubic zirconia stone in a 4-prong basket setting. Round cut cz stud earrings are now a must-have to any jewelry collection. Made of .925 sterling silver. FOR PIERCED EARS ONLY. UNISEX. Available stud sizes: 4mm (0.15"), 5mm (0.2"), 6mm (0.25"), 7mm (0.28"), 8mm (0.32") and 9mm (0.35").