Do I need a special wedding band for a hidden halo ring?

The risk on any hidden halo is that the side-set melee sits exactly at the height where a wedding band slides up against it. Two diamonds touching each other under normal hand movement is the textbook recipe for chipping and prong loosening, because diamond is the hardest natural material on the Mohs scale and only damages other diamonds. A diamond pave wedding band makes this worse on both rings, since the melee on each side grinds against the other every time the hand closes. A plain metal band still touches the halo but does no real damage, since gold and platinum are softer than diamond and give way first.

The first option is a thin plain spacer band of 1 to 1.5mm, sitting between the engagement ring and the wedding band so the two diamond sets never make contact. The second is a low-profile plain wedding band shaped to slide under the hidden halo without touching, which works only if the halo is high enough on the basket and the band thin enough. The third is a contoured band shaped to dip away from the halo entirely, which adds modest cost but solves the rubbing problem cleanly. Try the engagement ring against sample bands in person before committing, since each hidden halo head sits at a slightly different height.