No. Sacred objects, such as a crucifix that you wear around your neck, aren't actually blessed by the priest but are instead importart for what they symbolize. Must I wear a cross to seek the Lord's blessings? You don't need to wear a cross to receive blessings from the Christian God.

How do you bless a crucifix?

This blessing is made by the tracing of an upright cross or + across the body with the right hand, often accompanied by spoken or mental recitation of the Trinitarian formula: "In the name of the Father, and of the Son, and of the Holy Spirit. Amen."

What do you say when using a crucifix?

We being the Rosary Prayer with the Crucifix. We make the Sign of the Cross as we say: + In the name of the Father, and of the Son, and of the Holy Spirit. Amen.