For this rosary, I just looked through my bead supply and chose these colors at random. The Hail Mary beads are 8mm glass beads with a white and black marbling color. The Our Father beads are white howlite, also 8mm. The centerpiece is the Miraculous Medal, which features the inscription "O Mary, conceived without sin, pray for us who have recourse to thee". The crucifix is black enamel.