Tres chic! These playful Bow Stud Earrings make the perfect playful addition to any outfit. - Measures 10mm - 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.