The Diamond Rule Event is a pivotal arc in the rich history of the Steven Universe universe. This millennia-long event highlights the reign of the Diamonds, the extremely powerful gem matriarchs who shape the social structure and politics of the Gem House world. Made up of white, yellow, blue and pink diamonds, the Diamond Authority has played an important role in shaping the gem's cultural dynamics, interstellar conquests and technological advancements.
Yellow and Blue Diamond handled infrastructure and diplomacy, while White Diamond, the de facto leader, coordinated global affairs. Pink Diamond, the youngest, was eventually entrusted to her colony, Earth, leading to unforeseen events that would essentially challenge Diamond's rule and lead to a major rebellion that would change the course of the universe. This event comprehensively explores themes of power, identity, rebellion and redemption.