In Celtic folklore, the Shamrock is a charm against evil, an ancient tradition that has carried over into the modern belief in the four-leaf clover as a good luck charm. Legend has it that Saint Patrick used the clover to demonstrate the triple nature of the Father, Son, and Holy Ghost when he went to Ireland. Surrounded by Celtic Knotwork, these gemstone-accented Shamrocks in sterling silver by Peter Stone make a beautiful good luck charm.