18K Gold over Sterling Silver Hoop Earrings (27mm) Genuine Blue Sapphire and Diamond Accent 18k Yellow Gold Over Sterling Silver. Quality Stamp (.925) 16 Sapphire; 4 Diamond Item Measures 25 mm Wide x 2 mm High x 27 mm Long Pierced; Surgical Steel / Hypo Allergenic Post. Snap Bar Earring Back. Style: Hoop. Imported