Blue Diamond, or Blue for short, is a Homeworld Gem and a member of the Great Diamond Authority that formerly ruled over the Gem race. She first appears in a flashback in "The Answer" and debuts in person in "Steven's Dream".

As a result of Era 3, Blue Diamond now uses her powers to bring joy to other Gems through her clouds, created from her vaporized tears, which make someone happy once they come into contact with them.

== Appearance == Blue Diamond is more than 20,000 years old, stands at approximately 14'2" (432 cm, or about 2.6 Stevens tall, assuming Steven is 5'6"), and weighs roughly 1,200 lbs (545 kg).

As one of the rulers of Homeworld, Blue Diamond has a massive size, with her towering height making her own Pearl appear tiny in comparison. However, her somewhat hunched posture, combined with her long, sweeping cloak, gives her a relatively smaller and more despondent silhouette than if she were standing straight.

Her complexion is azure, and she has long, straight, alice blue hair which curls inward at the ends. Two noticeable and symmetrical locks of her hair curl and point inwards towards her face just below her cheekbones. A unique feature of her hair is two lengths that lead from each side of her head and physically connect on her chest just below her gem, giving it an almost shawl-like appearance. She has a long ovoid face, a full upper lip, and a straight nose. She also possesses large, sad, downward-slanting eyes with bold mascara on the lower lashes, giving the appearance of a weeping woman, most likely due to her depression over the supposed shattering of Pink Diamond. Her irises are cyan with black diamond-shaped pupils, and she has thin arching eyebrows.

Her gemstone is located on her chest above her sternum, and she wears a long navy blue cloak that touches the ground. Underneath the upper part of her cloak, she wears a navy blue hood. Her height is similar to Yellow Diamond's, only obscured by her hunched posture, making her look shorter.

== Personality == Blue Diamond is characterized by a deeply emotional and melancholic demeanor. She mourns the loss of Pink Diamond profoundly, which manifests in a mournful and often somber presence. Despite her sorrow, she cares deeply for the Gems under her authority and exhibits a nurturing side, especially in Era 3, where she seeks to heal emotional wounds and bring comfort to others. Her empathy is powerful but can be overwhelming, as she sometimes unintentionally projects her grief onto others, making them share in her sadness.

She is patient and diplomatic, often preferring to resolve conflicts through emotional influence rather than confrontation, a stark contrast to Yellow Diamond's more aggressive approach. Her leadership style is more introspective and reflective, highlighting her role as the compassionate, albeit grieving, pillar of the Great Diamond Authority.

== Gemstone == Blue Diamond's gemstone is located on her chest. It's blue and has a kite diamond-shaped facet.

== Powers & Weapons == Blue Diamond possesses a range of powerful abilities typical of Diamonds, as well as unique powers centered around her emotional influence. Like all Gems, she has enhanced physical strength, durability, and immortality, allowing her to survive extreme situations and reform after being poofed. She can shapeshift and has the potential for fusion, though these abilities are rarely shown.

One of her signature powers is the projection of a blue, water-like aura that can interact with physical objects—she has used this to break water chains and attack opponents with focused energy.

Blue Diamond’s most notable ability is her radiated pathokinesis: she emits an aura of intense sorrow that forces others within range to experience overwhelming grief, often incapacitating them emotionally and causing tears and despair. This aura can disrupt Gem fusions, as seen when Alexandrite defused under its influence. Additionally, she can generate and manipulate energy to form destructive constructs like spheres or blasts, and her immense strength allows her to perform feats such as snapping Rose Quartz’s sword and throwing large objects.

Blue Diamond also commands a warship, which she pilots and uses in combat.

Under the control of White Diamond, she can levitate and is capable of creating a white capsule that serves purposes such as levitation and teleportation. She can also emit a white energy beam from her eyes, enabling mental control over other Gems.

Overall, Blue Diamond’s powers blend formidable physical might with potent emotional manipulation, making her a uniquely fearsome and influential figure among the Diamonds.

== Trivia ==

• Blue Diamond is the first of the Diamonds to be seen on-screen in an episode of Steven Universe. However, Blue Diamond was not the first of the Diamonds to be revealed in Steven Universe media as a whole. The extended theme song reveals Yellow Diamond.
• Rebecca Sugar has mentioned that blue-colored Gems are mainly diplomats.
• According to her mural, Blue Diamond ruled over nine planets when the Moon Base was built. It is unknown how many she currently rules.
• Many Gems under Blue Diamond have similar gemstone designs (wider at the bottom, tapering to a point on top), reminiscent of a teardrop shape.
• Blue Diamond's powers and personality may be symbolic of emotional abuse; abusers of this type tend to tamper and manipulate the emotions of others to make their victims sympathize with them more than they otherwise would, making them feel too guilty to leave the relationship or feel obligated to remain in it. This is supported by her highly and negatively emotional (almost to a dramatic extent) mindset, as well as the fact that her pathokinesis effectively forces her emotions onto others, typically against their will.
• It seems that Blue Diamond wears a cloak while she is traveling and doesn't wear one when she is on Homeworld and her places.
• Blue diamonds represent peace, spirituality, and good health. This is ironic, given that her lasting grief and mourning over Pink is far from an improvement to her well-being.
• Blue is the only Diamond to not speak with an American accent; instead, she has an Irish accent.

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