18 mm White Gold Capped Hoop EarringsWhite Gold Hoop Earrings These 9ct white gold hoop earrings measure 18 mm in diameter and feature a highly polished finish. The classic hoop silhouette is completed with a smooth, capped design for a clean and continuous look. Crafted from 9ct white gold, an alloy composed of 37. 5% pure gold mixed with other white metals, the earrings offer excellent durability. This composition also gives the metal its characteristic bright, silvery appearance.