9ct Black Sapphire Rubover Stud EarringsBlack Sapphire Stud Earrings These 9ct yellow gold stud earrings each feature a round black sapphire measuring 5mm in diameter. The deep colour of the sapphires provides a distinct contrast against the warm tone of the yellow gold. Each stone is held securely within a rubover setting. This setting style, where a fine border of gold is smoothed completely around the edge of the sapphire, offers excellent protection and creates a clean, modern look when