Silver Gents Earring with 6mm Square Black CZBlack CZ Silver Earring This gents stud earring is crafted from 925 sterling silver and features a single, square cut black cubic zirconia. The sterling silver composition, which consists of 92. 5% pure silver, provides a durable and bright metallic base for the central stone. The black cubic zirconia measures 6mm, creating a clean and defined look within its silver setting.