Blue Diamond

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" Greg 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 Diamonds 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.

Blue Diamond has a massive size and height due to her being a Diamond. Her height maybe tall but it is nothing compared to White Diamond's height. 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