Shop 4MM PLAIN SILVER HOOP EARRINGS15mm Plain Silver Hoop Earrings. 420-SIL-4-101 15mm Plain Silver Hoop Earrings. 420-SIL-4-101 € 165.00 15mm diameter - Plain Silver Hoop Band measures 4mm wide. These lovely earrings hug the ear securely and are worn with a traditional spring butterfly fitting.