Blue Diamond | Steven universe |

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 are two lengths of 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, only obscured by her hunched posture making her look shorter.

Blue Diamond's temperament appears to have changed significantly in the 5,000 years following the supposed shattering of Pink Diamond. She fell into a prolonged state of grief and depression upon believing Pink Diamond was shattered. 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 not understand humans, given by how she was surprised that Greg was able to comprehend and sympathize with her pain of losing a loved one, in addition to displaying an apparent unawareness of masculine pronouns, though this is understandable since she is not native to Earth and has had very little reason to get to know humans.

The Trial 135 Blue Diamond, as shown in the episode "The Trial", is extremely diplomatic. 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 the defending 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 and forgiving as her gems claim – at the very least, she certainly has greater respect for due process and an interest in the truth.

In "Reunited", despite her unreasoning aggression towards the Crystal Gems, Steven later heard Blue's thoughts, that despite seeking to do them harm it only made the pain she felt worsen and her

longing to see Pink grow.

After learning of Rose Quartz and Pink Diamond being the same person, she has shown concern over Steven along with Yellow Diamond. She has also shown extreme affection for Steven/Pink as seen through the effect her powers have on those around her, as along with extreme sentimentalism causing Yellow to have to reign her in. Additionally, Blue is shown to have a humorous side to her, poking fun at Steven's name in "Familiar" and making remarks that amuse Yellow and White Diamond in "Change Your Mind".

Together Alone 164 Despite her more merciful, compassionate, 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 Diamond. In "Together Alone", she was extremely cynical and cruel to the Crystal Gems, especially Garnet, referring to her as "that". She also demanded Steven and Connie un-fuse and doesn't stop Yellow Diamond from locking Stevonnie in a prison tower.

However, after Steven challenges her beliefs when she comes back to check on him, she breaks down and realized that she had been making Pink Diamond suffer all those times she locked her up and made her cry. She remorsefully admits that it was right of Pink to leave Homeworld since she hadn't been treating her right. With this resolve, she decides to help Steven and Connie escape, even going as far as accepting Steven as himself and briefly fighting Yellow Diamond to help him and his friends make it safely back to Earth.