The Sirena pearl hoop earrings feature a scattering of pearls over gold on a 20mm hoop secured with a butterfly backing. You will feel like a golden mermaid goddess in these gorgeous statement hoops! - Measures 20mm in diameter - Hypoallergenic, water-resistant - Heavy 18kt Gold Plate over brass with e-coating for extra longevity ** Our pieces are plated 1 micron thick, industry standard is .125. Quality is extremely important to us, and we wanted to ensure these pieces will last and work well for sensitive ears