The “Ephod”(breastplate) one of the eight holy garments that the Kohen Gadol (High Priest) used to wear when conducting his services in the Holy Temple, had 12 Gem Stones each one representing each of the 12 tribes of Israel. The breastplate hanged in the middle of the Chest of the Holy priest. Aharon the first Kohen Gadol loved everyone unconditional, he used to make peace amongst husband and wife, parents and children, friends , family members and anyone who had a strife. When he died the Jewish people mourned him profusely. That is why the Ephod went in the chest because Aharon held everyone in his heart.