Can you cast Hunger on an enemy’s item and have it move with them?

Hunger of hadar reads:

A 20-foot-radius sphere of blackness and bitter cold appears, centered on a point with range and lasting for the duration.

When casting it, would the wording of the spell allow my warlock to cast the spell on the enemy’s weapon or a necklace that is worn, (a point I can see), and allow the spell to move with target?