Shop › Silver CZ Halo Cluster Ring Image 1 of 1 Silver CZ Halo Cluster Ring £25.00 925 sterling silver cubic zirconia oval single stone ring in a CZ halo setting, with twisted shank detail. Ring size UK M. Purchase Added! 925 sterling silver cubic zirconia oval single stone ring in a CZ halo setting, with twisted shank detail. Ring size UK M.