Silver Round Opal Stud Earrings with Beaded HaloOpal Stud Earrings These sterling silver stud earrings each feature a single, 3mm round opal stone set within a high polish silver frame. A delicate halo of silver beading surrounds each opal, a detail known as a Millgraine effect, which gives the setting a fine, vintage inspired texture. The bright, reflective surface of the polished sterling silver complements the shifting colours within each opal. As the birthstone for October, these earrings are a