The Twelve Tribes Breastplate is designed from God’s commandments found in Exodus 28, and rich in symbolism and spiritual meaning. The breastplate acts as a reminder that all divisions of Israel should brought before God in prayer. It was also a reward to Aaron that he was glad in his heart when Moses returned to Egypt, a symbol that he was not envious that God had chosen his younger brother to deliver Israel and content in his lot. (Exodus 28:29)
As a vestment of the high priest it was also called the breastplate of judgment, as it was intended to work atonement for errors in pronouncing judgment. There are also New Testament references in Revelation 21:19-20 that possibly correlate the foundations of the New Jerusalem with the design of the breastplate.
For Christians today the Twelve Tribes Breastplate can act as a reminder of Israel’s deep history, a prayerful reminder to bring all of God’s people before Him, a symbol of confidence and contentment in what God has given you, and a connection to the final fulfillment of God’s works found in the new Holy City.