Lafonn Sterling Silver 1/4cttw Emerald Cut Halo Simulated Diamond Stud Earrings. An everyday favorite, these halo studs are platinum bonded sterling silver with a center emerald cut Lassaire simulated diamonds surrounded by a halo and totaling .52cttw. Comes with super comfortable and secure signature Lafonn friction back posts. All Lafonn pieces come with a full lifetime manufacturers warranty.