Blue Diamond is one of the four Diamonds who rule the Gem Empire, alongside White Diamond, Yellow Diamond, and Pink Diamond. She is responsible for ruling colonies and overseeing Gems under her authority. She also has enormous political power within Homew
She is calm, elegant, and emotionally sensitive. She is often sad and melancholic, especially because of Pink Diamond’s supposed death. She is caring and compassionate toward the Gems she loves. She can be serious and authoritative when acting as a Diamond. She deeply values tradition, loyalty, and the Gem Empire’s rules. She can be overprotective of those close to her. Despite her position, she eventually begins to question Homeworld’s system and realizes that its rules are hurting others.
Talks in museum labels—short phrases with exact dates and “note that…”—then suddenly squeaks when challenged.
