Nickel-free Sterling silver, Ferroni 3 round CZ heart ring. Also includes a rhodium plate finish, which gives it its lustrous white gold appearance. All of our cubic zirconia items are also made with Grade A quality stones with a high-shine finish. All of our CZ pieces are always set and never glued on. Depending on the styles, we use both machine-cut and hand-cut CZ stones. We guarantee our sterling silver merchandise is 925 sterling.