AboutTin:Tin is the fourth rare metal after platinum, gold, and silver. It is harmless to the human body and is called a green metal. Tin is not easy to oxidize and will not leave marks on the wearing position. The Front Side On the front of the Miraculous Medal, Mary stands on a globe, representing the earth, with a crushed snake under her feet. This image represents Marys role asQueen of Heaven and Earthâ. The snake represents Satan, who was defeated by Marys obedience to God. The rays coming from her hands symbolize the graces Mary gives to those who ask her. The year 1830 commemorates the year that the Blessed Mother appeared to St. Catherine Laboure. The Reverse Side On the reverse side of the Miraculous Medal is a cross and the letterMâ. The cross represents Christs sacrifice for our salvation, while the bar under the cross stands for the Earth. TheM stands forMary and her true devotion both to Jesus and to her children on Earth. The two hearts are the Most Sacred Heart of Jesus and the Sorrowful Heart of Mary. The entire image is surrounded by twelve stars. The stars can represent both the twelve Apostles and the verse from the Book of Revelation,a great sign appeared in heaven, a woman clothed with the sun, and the moon under her feet, and on her head a crown of 12 stars (Revelation 12:1).