Cerrillos Stacka set of two rings formed from organically carved wax to mimic mountains and hills. Product details: Original design carved in wax and cast in sterling silver Ring bands measure 4. 5mm 5 mm each Mixed Metal rings will feature a gold single mound ring and a silver double mound ring. Vermeil gold rings are 14K gold plating over silver *please note, as the cerrillos stack is a thicker, solid, heavier ring set. These rings are not hollow. You may want to