The invocation on the medal

During the second apparition, Our Blessed Mother explained to Saint Catherine "how pleased she is when people pray to her and how generous she is with them; how she gives special graces to those who ask; and what a great joy she takes in granting them."

At that point "a frame formed around Our Lady, like an oval, bearing the following words in gold letters: 'O Mary, conceived without sin, pray for us who have recourse to thee.'"

Let us pray: O Most Holy Virgin, O my Mother, obtain for me the graces I am asking of thee and inspire me, above all, to request the graces that thou most wants to grant me.

Say 1: Our Father...

Say 1: Hail Mary...

Say 1: Glory Be...

O Mary, conceived without sin, pray for us who have recourse to thee! Amen