According to Marie-Julie,The Most Blessed Mother wears this medal on Her Heart and I read it very well, She shows it to me: It is round and white ; The Blessed Mother adds:

"It is not necessary that this medal be of a great price, its value will be the same. This will be to keep the innocence in a time so difficult, when the pestilence of corruption will be effused everywhere. All Christians will be able to provide themselves with this medal as a defense and as a weapon of Faith that will conquer sinful living and the treachery of evil.

They can be purchased as low as A$2.00 when purchasing in bulk.