I get asked about weird gear names all the time, and
the binding necklace is one that trips people up — so here’s how I break it down in plain terms.
There isn't an item officially called a 'binding necklace' in Old School RuneScape that grants a unique PvP-on-hit bind effect. What people sometimes mean by that phrase is either a misconception carried over from RuneScape 3, a misremembered ring/
amulet, or they're talking about the general idea of a necklace that would 'bind' somebody (i.e., root them). In OSRS PvP the actual ways to stop someone moving are spells, special attacks, and gear combos: entangles/snare/bind-type spells, teleblock to stop teleporting, and stuns or position-control from things like the Dragon dagger special attack. Necklaces in OSRS are usually about offensive or defensive stat boosts and sometimes special teleports, not movement-impairing procs.
If you were thinking of practical PvP perks a hypothetical binding necklace would give, they’d be utility-focused: chance to root on hit (great for skulling/trapping), better ability to finish-with-melee or combo, and synergy with teleblock so you and your team chain kills. But because that exact item doesn't exist here, I usually recommend choosing real necklaces that suit your role — 'Necklace of anguish' for ranged-heavy setups, 'Amulet of fury' or 'Amulet of torture' for melee hybrids, and using spells and stuns to lock people down. Personally, I prefer building my strategy around reliable mechanics (teleblock, binds from spells, safe-special windows) rather than hoping for on-hit procs from rare gear — feels more consistent to me.