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The formerly vile Irish alien Blue Diamond

Blue Diamond (Lisa Hannigan) is a major antagonist in the series Steven Universe. She is one of the Gem Matriarchs on Gem Homeworld and a member of the Great Diamond Authority ruling over Homeworld. Blue Diamond was apparently responsible for overseeing an attempted colonization of Earth, and later, the attempts to quell the Rebellion of the Crystal Gems.

In general, she serves as an unseen overarching antagonist of Seasons 2 and 3, a minor yet pivotal antagonist in Season 4, and a major antagonist in Season 5, appearing as the secondary antagonist of the first half and a supporting character in the second half. She later serves as a supporting character in Steven Universe: The Movie and Steven Universe Future.


Blue Diamond has a massive size and height due to her being a Diamond. Her hair is a very pale shade of blue, appearing as off-white and also together in the front to reveal her gem. She has a gaunt face, full lips, and a straight nose. She also possesses large, slanting eyes with light blue irises and diamond-shaped pupils, thin black eyebrows, and three black markings on the lower portion of her eyes resembling eyelashes. Her gemstone is located on her chest, and she wears a long navy blue cloak. Underneath her cloak, she wears a navy blue cowl. She also appears to be slightly shorter than Yellow Diamond, who herself wears heeled boots.


Blue Diamond's debut portrays her as a very good-natured and mellow Diamond who treats high-ranking members of her court with respect. According to Holly Blue Agate, Blue Diamond has a reputation for mercy, sympathy, and forgiveness. "Saving" Gref from the threat of the Cluster after taking a liking to him, unaware that the Cluster is formerly inactive, demonstrates this. However, as with Yellow Diamond, her true nature may be at odds with her reputation, as she sentences Ruby to shattering for accidentally fusing with Sapphire while trying to do her job and saving her by accident. However, it is unknown if her personality has changed over the millennia after Pink Diamond's death. Blue Diamond's temperament appears to have changed significantly in the 5,000 years following the death of Pink Diamond. She was in a state of great depression, still mourning over the shattering of her fellow diamond.

She is unable to let go of the past, becoming fixated on preserving Pink Diamond's legacy. Her efforts to maintain the late diamond's zoo, save Earth specimens from the Cluster's emergence, and her refusal to shatter the rose quartzes that once served under Pink Diamond shows this behavior. She continues to regard the Earth as Pink Diamond's colony, and, due to being unaware that the Cluster is bubbled, is visibly saddened by the fact that the planet will eventually be destroyed. Additionally, Blue Diamond seems to misunderstand humans, given by how she was surprised that Greg was able to comprehend and sympathize with her pain of losing a loved one. As shown in the episode "The Trial", Blue Diamond is extremely opportunistic, diplomatic, and dexterous. Against Yellow Diamond's wishes, she allowed Steven to continue making his case during his trial, though she did lose her temper when his recounting of events differed. She nonetheless seemed to want to hear Blue Zircon's theory on how and why Pink Diamond was shattered. When Yellow Diamond snaps and poofs both Zircons present at the trial, Blue Diamond confronts her and scolds her for not having enough restraint to hear the case out. This shows that Blue Diamond may be as merciful, forgiving, and sympathetic as her gems claim – at the very least, she certainly has a greater respect for due process and an interest in the truth.

However, despite her more merciful and forgiving nature, she is shown to be extremely unforgiving and derogatory towards fusions of different gems, something that she shares in common with Yellow. This is first seen when Blue Diamond sentenced Ruby to be shattered just for fusing with Sapphire out of a desire to save her life, demonstrating her ruthlessness towards these situations. Even after 5,000 years, her attitude towards these situations has not changed. When conversing with Steven, she mocked Garnet's fusion and stated that she didn't belong anywhere. Then, when Steven and Connie fused, Blue Diamond lashed out at Steven, viewing such a fusion as extremely inappropriate, and demanded they unfuse immediately. She also had no qualms about locking Steven up as punishment for his actions.

Despite this, her tyrannical ways appear to be merely her enforcing White Diamond's rules on Homeworld, and that she and Yellow are in fact miserable under White's rule. She is also shown to be empathetic enough to understand that the Homeworld Gems are suffering because of the Diamonds' ways. After making amends with White, Blue appears to be much kinder and more benign, accepting the Crystal Gems and Off Colors, in addition to being the one to figure out how the Diamonds can cure the Corrupted Gems.

Powers and Abilities

Like all her subjects, Blue Diamond has the standard abilities of a Gem, those including: Enhanced condition, the ability to not age, and, potentially, shapeshifting and fusion. However, she has a greater amount of power within due to her status as a Diamond and member of the Great Diamond Authority.


  • Spaceship Piloting: Blue Diamond has a spaceship only she is capable of controlling, until it was repaired by Bismuth, Peridot, and Lapis Lazuli. She is able to use the ship in combat.

Unique Abilities

  • Aura Projection: The Diamonds can project an aura around them that they can control, they can either radiate it from their entire bodies or emit it from specific parts of their bodies, usually their hands. Blue's aura is blue and has water-like properties. Though intangible, Blue was able to break Lapis' water chains from her hands upon coating her hands with her aura. She can use this as an offensive ability in both the physical and mental plane, as seen when she was able to focus her aura and attack Steven as he was projecting.
    • Radiated Pathokinesis: In addition, Blue Diamond can engulf a large area with her aura which induces sorrow to anyone exposed to it. The induction is powerful enough to cause Gems exposed to the aura to break down and cry immediately unprovoked, even affecting Yellow Diamond to a small degree. When she unleashed her grief over Pink Diamond's death, she instantly rendered the Crystal Gems unable to fight. The aura is also potent enough to split all but the most stable Gem fusions that get caught in it apart, as Alexandrite came undone as soon as she was affected by the aura, while Garnet remained whole. The level of resistance to the ability varies. Non-human animals are apparently not affected, as demonstrated by Lion during Yellow and Blue's attack on Earth. Humans can still be affected as long as the aura is strong enough, as Connie was immune to Blue's first attack but collapsed in tears on her next attempt. Gems who have endured emotional trauma worse than the feelings induced by the aura can resist it almost completely, as Lapis Lazuli barely shed a tear upon being hit by the aura. It's unknown if this ability is limited to Blue Diamond's sadness or if she can project other emotions.
    • Corruption Induction: Though the attack was meant to obliterate the Crystal Gems on Earth after Pink's supposed shattering, Blue, Yellow, and White Diamond's collective powers instead corrupted the remaining Gems on Earth.
      • Corruption Reversal: Along with Pink/Steven, White, and Blue Diamond, Yellow Diamond has the ability to reverse the effects of the Corrupting Light on Gems. However, it is implied that this is only temporary without the power of all four Diamonds. The four reversed the corruption on the water of Rose's Fountain in "Change Your Mind".
    • Psychic Resistance: Blue Diamond's aura shields her from telepathic abilities such as Pink Diamond's even without her own awareness, briefly repelling Steven with the sheer intensity of her thoughts. She was also able to locate Steven on the mental plane when he was not in physical contact with her.
      • Psychic Blast: While on the mental plane, Blue Diamond can fire her aura as a beam which induces profound distress in the target; however, despite combining her assault with Yellow Diamond's, it was repelled by Steven's own aura.
    • Energy Construction: Once Blue Diamond broke free of Lapis water chains, she was able to create a ball of stellar light and it was able to shoot out blasts and explosions.
  • Enhanced Strength: She is able to break Rose's sword with just the snap of her fingers and throw the barn off of her in a fit of rage. However, this might just be a simple matter of physics due to how large she is.
  • Immense Durability: Blue Diamond seems to be more durable than other gems as she was able to survive when Lapis threw the barn on top of her and when her hand ship landed crashed on top of her and she came out without a scratch (while this would have likely poofed other gems). This is likely due to her sharing the same invulnerable nature as her gem, much as how Peridot's gem type gives her extreme durability.

Clandestine Abilities

  • White Capsule Generation: While controlled by White Diamond, Blue Diamond can create a kind of white capsule around itself or other gems, with several utilities.
    • Levitational Transport: The capsule can also float around, as seen in "Change Your Mind".
    • Teleportation: The capsule can also teleport Blue Diamond, as seen in "Change Your Mind".
  • Levitation: While controlled by White Diamond, Blue Diamond has the ability to, indirectly, suspend her body.
  • White Burst: While controlled by White Diamond (probably via the same), Blue Diamond is capable of shooting, through her eyes, a white energy beam equivalent to White Diamond's aura, in which it can also control, mentally, the affected gems.


Blue Diamond is one of the members of the Great Diamond Authority alongside Yellow Diamond, Pink Diamond and, presumably, White Diamond. As the matriarchs of Gem Homeworld, she was in charge of colonizing planets for Gem colonizations and expansion.

Season 2

In "The Answer" Blue Diamond appears on-screen for the first time in a  Garnet's story narrating how Ruby and Sapphire met each other. It is revealed that she was once the supervisor of the colonization of Earth following the death of Pink Diamond at Rose Quartz's hands. To make sure the progress of colonization was completed, she had a Sapphire predicting the further events to come. However, when Ruby risked her life to save Sapphire's they fused into Garnet and gave enough time for Rose Quartz and Pearl to escape from the battle arena. When this happened, Blue Diamond angrily threatened Ruby that she would be shattered for fusing with one of her court members and for letting the rebels escape. However, Sapphire took Ruby from the hand and left the arena falling to the earth surface in time. Blue Diamond was never seen again through the episode after that. In "It Could Have Been Great", Blue Diamond's mural is seen on the moon base alongside Yellow, White and Pink Diamonds' and is mentioned by Peridot too.

Season 3

In "Back to the Moon", Blue Diamond's mural is once again seen on the moon base when the Crystal Gems and the Ruby Squad went to visit the place.

Season 4

Blue Diamond appears in "Steven's Dream" in her first onscreen appearance, Blue Diamond returns to Earth one last time to pay her respects to Pink Diamond before, as she believes, the Cluster will emerge, unaware that Steven had contained the superweapon months earlier. Blue Diamond expresses regret over how she should have done more, and wonders what Pink Diamond would think of the Cluster destroying her colony. After Greg reveals himself, Blue Diamond asks her Pearl to bring Greg to her. She then states how she is impressed by humanity's ability to survive in the wild and remarks on the irony that a fragile human can survive on Earth while a being as powerful as a Diamond can perish. When Greg tells her that he also lost someone close to him, Blue Diamond is surprised that a human can sympathize with her, and is glad that she can save Greg from the Cluster. She forcefully takes Greg and boards her ship with the goal of bringing him to Pink Diamond's zoo.

In "Gem Heist" Holly Blue Agate reveals that after Pink Diamond was shattered, Blue Diamond took over her Zoo in an attempt to preserve her legacy. Blue Diamond and Holly Blue have been maintaining the Zoo since Era 2 began.

In "That Will Be All" Blue Diamond returns to the Zoo to mourn alongside a room full of bubbled Rose Quartzes. She is shocked to find Yellow Diamond entering the room, and tells her that she just wants to cry alone. Blue Diamond listens to Yellow Diamond's song, comforts Yellow when it ends, and is greeted afterward by Holly Blue Agate and the Crystal Gems. Blue Diamond does not understand what Holly Blue means by Sapphire's "special delivery". Once Sapphire lies, and tells her that she foresaw Blue Diamond requesting more humans for the zoo, Blue Diamond believes her, and is sad to announce that there is limited time to retrieve more humans due to the Cluster.

Season 5

In "The Trial", Blue and Yellow Diamond attend the trial of "Rose Quartz" (Steven) after he is brought to Homeworld by Aquamarine and Topaz. After arriving at the trial, Yellow Diamond states that they should shatter Rose Quartz just for how ugly her new form is, however, Blue Diamond states that she wants to hear Rose's case and wants to know what she thinks they will do to her, because she wants to do something worse. After Eyeball comes in as a witness and does massive damage to Rose's case, Blue Diamond, unlike Yellow Diamond, opts to hear out the defense anyway. After Steven confesses to shattering Pink Diamond, Blue Diamond demands to know how, and when Steven doesn't recall exactly how it happened, Blue shouts at him, telling him that Rose used a sword (also using her Pathokinesis to make everyone in the room cry).

After the recess break, Blue Zircon, upon having the sudden realization that Pink Diamond being shattered by Rose Quartz doesn't make sense, presents Blue Diamond's Palanquin to the Diamonds and asks where Pink Diamond's Pearl, Sapphires and other gems were to protect her or predict Rose's arrival, coming to the conclusion that another Diamond was the only gem that could have gotten anywhere close to Pink Diamond without anyone being alarmed, although her and Yellow Zircon forms are destroyed by Yellow Diamond immediately afterwards. Blue and Yellow Diamond then get into an argument over the point of investigating Pink Diamond's death, leaving Steven and Lars to escape using the Palanquin.

In "Your Mother and Mine", Blue Diamond's silhouette is briefly seen along with the other diamonds' silhouettes. Later in the flashback, after the Crystal Gems were formed, Pink Diamond called Yellow and Blue Diamond for help. After Pink was shattered, her silhouette is seen with Yellow and White Diamond's. Their hands are seen in the next shot, launching the Corruption Attack.

In "Can't Go Back", in a dream Steven is having that involves the Diamonds, Blue Diamond tells Pink to stop worrying about the issues on Earth and chides her to just wave and smile in front of her subjects, believing Rose Quartz can't hurt her, before following Yellow out of the room.

In "A Single Pale Rose", Rose Quartz, revealed to actually be Pink Diamond, states that Blue and Yellow don't care about her.

Blue Diamond and Yellow Diamond arrive to the Earth in the episode "Reunited" in order to activate the Cluster. The Cluster emerges but it turns against them. Blue Diamond personally fights against the Crystal Gems and uses her emotional powers against the Gems, but Garnet is able to keep her preoccupied so that Lapis could drop the farmhouse on her. Whilst the battle continued, Steven is able to speak with both her and Yellow Diamond telepathically, making her finally realize that he was Pink Diamond.

In "Legs From Here to Homeworld", Blue Diamond expresses delight that Pink is still alive as Steven and tearfully hugs him. Later, it's revealed that she was apparently under the impression that she and Yellow had completely decimated the Gem forces on Earth, most likely meaning that she was unaware of the idea of corrupting Gems until Steven presented Centipeetle to her and Yellow. Later, she, Yelllow, and Steven leave to Homeworld to seek help from White to cure the Corrupted Gems, only for Steven to be the one going to White Diamond instead upon arrival.

In the episode "Together Alone", Blue and Yellow Diamond can be seen sitting on their respective thrones, discussing with Steven and the Crystal Gems about planning for a ball. In this same episode Blue and Yellow reveal their xenophobia towards Fusion remains and go as far as imprisoning Steven for Fusing during the ball, as well as attacking Opal and an unnamed Jade Fusion.

She remains hostile towards Steven in "Change Your Mind", attacking him with an energy ball when he tries to reason with her and saying that his time on Earth has warped his sense of right and wrong. Nonetheless, Steven helps Blue realize how badly she treated Pink in the past, and she tries to make up for it by helping Steven and Connie return to Earth alongside the Crystal Gems. Unfortunately, her efforts result in her and Yellow being mind controlled by White, and she only reverts back to normal when White is defeated by Steven. She later goes to Earth and cures Corruption alongside Yellow, White, and Steven, before returning to Homeworld in hopes of turning it into a better place.



Steven Universe Blue Diamond talks to Steven

Steven Universe Blue Diamond talks to Steven

Steven Universe The Crystal Gems fight Blue Diamond Reunited Cartoon Network

Steven Universe The Crystal Gems fight Blue Diamond Reunited Cartoon Network

Blue Diamond's Song Steven Universe Future

Blue Diamond's Song Steven Universe Future

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