Inspired by connections and unity, Batala’s interlocking rings represent the bonds people share. This collection’s power and energy will let you be as daring as you want. TOUS Batala Bangle in silver vermeil with 0.6 cm. ø 6.5 cm. Howlite. Vermeil is a layer of 18kt gold on sterling silver with a minimum thickness of 2.5 microns, with no other material between them.