The halo setting does something that no other earring configuration achieves as efficiently: it makes a center stone appear substantially larger than its actual dimensions while simultaneously surrounding it with a secondary ring of brilliance that amplifies rather than competes with the stone at the center. In a ring, this effect is appreciated by one person at a time. In an earring worn at face level — where every conversation partner, every colleague, every passing glance lands — the effect is appreciated continuously, all day, by everyone the wearer encounters.