Sistema RingWHY WE LOVE IT The Sistema Ring is a core expression of Parts of Fours modular philosophywhere structure, surface, and variation coexist. Defined by a wide, architectural band, the ring emphasizes proportion and material over ornament, allowing finish to become the focal point. Available in Dirty Sterling or Polished Sterling Silver, the ring presents two distinct expressions of the same form. The Dirty Sterling finish is achieved by dipping sterling