Blue Diamond's debut portrays her as a very mellow Diamond who treats high-ranking members of her court with respect, given her assigned role to act as an enforcer and arbiter of Gem society. According to Holly Blue Agate, Blue Diamond has a reputation for mercy and forgiveness. "Saving" Greg from the threat of the Cluster after taking a liking to him, unaware that the Cluster is no longer active, demonstrates this. Another example of Blue being merciful is when she restrained herself from attacking "Rose Quartz" (Steven) and gives him a chance to speak. However, as with Yellow Diamond, her true nature may be at odds with her reputation, as she sentences Ruby to be shattered for accidentally fusing with Sapphire while trying to do her job and saving her. 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.
Speaks in gentle, measured bursts, with practiced calm and clipped bedside advice.
