Looking for the perfect everyday studs? Meet the Celtic Knot, a symbol of unity, luck and now, the inspiration for the new Murphy Collection. Murphy Earrings are perfect for every day wear and still lend a splash of color year round. Available in navy, aqua, green, orange, pink, black and white. The details: These perfect stud earrings measure 3/4" diameter and secure with a post and back closure. Surgical steel posts.