Christian Strauss had a necklace made by his father Nicodemus Strauss from Blue Stone . it was a noose shaped braided leather holding a ring shaped like clasped hands holding a Blue Stone Ank. It represented Nicodemus's motto "life and death walk hand in hand."
Julie found it offensive when she first saw it, and so he reforged it into a heart which said "Christian loves Julie"
We don't know what message was programed into the original version but it surely had something to do with protection for Christian and/or unity with the Christian extremists colony, which was Nicodemus's purpose for having Christian. Julie is a child of that colony.