Blue Diamond

"I should've done more. Yellow says it'll all be over soon. I wonder what you would think. This is your planet, after all. I still think it is."

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

Personality
As shown in her debut, Blue Diamond is portrayed as a very mellow Diamond and seems to have a level of respect for her court members with the greatest usefulness, as she was very friendly when talking to Sapphire. However, she was also shown to be intolerant of any form of violation even by accident, wanting to have Ruby shattered for accidentally fusing with Sapphire while trying to do her job. She also seems to be cowardly, running to safety as soon as Rose Quartz showed up.

In "Steven's Dream", Blue Diamond is shown to be very distraught by Pink Diamond's shattering. She is shown to have a merciful side, "saving" Greg from the threat of the Cluster after taking a liking to him.

Blue Diamond displays great depression, having mourned the loss of Pink Diamond for thousands of years after Pink Diamond was shattered, and has issues in letting go and moving on.

Additionally, Blue Diamond seems to not understand humans, given by how she was surprised that Greg (a human) was able to understand and sympathize with her pain of losing a loved one, and while she considered it a shame that Earth would be destroyed by the Cluster, she doesn't appear to intend to do anything to prevent it.

Appearance
Blue Diamond, as one of the rulers of Homeworld, is of a massive size, her height making a common pearl's pale in comparison. Her complexion is light blue and her hair is off-white. She has a gaunt face, full lips, and a straight nose. She also possesses large, sad, slanting eyes, light blue irises, 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, dark blue cloak.

"The Answer"
After Rose Quartz and Pearl rebelled, Blue Diamond called Sapphire to Earth to share a vision of the future. Once Sapphire explains what the rebels will do on the Cloud Arena, Blue Diamond thanks Sapphire for her vision. Once Rose and Pearl show up, Blue Diamond's Palanquin grows spider legs to get her to safety and protect her. Blue Diamond is later disgusted by Ruby and Sapphire's fusion, threatening to shatter Ruby for fusing with a member of her court.

"Steven's Dream"
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.

"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.

Sapphire
Sapphire was an aristocratic member of Blue Diamond's court. She was valued dearly for her ability to see into the future. She appears to talk frequently with her, by Sapphire's words. Blue Diamond went as far as to sentence Ruby to be shattered just for fusing with her, which resulted in Sapphire immediately fleeing the scene with Ruby and terminating her relationship with Blue Diamond.

Blue Pearl
Blue Diamond has her own Pearl, assumed to be her servant. Not much is known about her, in part due to her silent nature, but in "Steven's Dream", she exhibits great loyalty and respect towards her Diamond and follows her every command, only speaking herself when addressed.

Pink Diamond
Blue Diamond described her past relationship with Pink Diamond as very close and still grieves for her thousands of years after she was shattered by Rose Quartz. In his dreams, Steven saw Pink Diamond's abandoned Palanquin where Blue Diamond knelt down and wept over her passing, which led him and Greg to seek out the location and find Blue Diamond there. Blue Diamond also seems to care about protecting Pink Diamond's legacy, since she decided to take Greg to Pink Diamond's Human Zoo in space so that one more human could be saved before the Earth was destroyed by the Cluster.

Holly Blue Agate
While the full extent of their relationship is unknown, Blue Diamond entrusted Holly Blue with managing Pink Diamond's Zoo, which suggests that she very much trusts her, as Blue Diamond takes anything relating to Pink Diamond very seriously.

Ruby
To Blue Diamond, Ruby is nothing more than one of the common and insignificant soldiers under her command. When Ruby accidentally fuses with Sapphire, Blue Diamond immediately decides to shatter her gemstone as a punishment, even though the unexpected fusion saved Sapphire.

Greg Universe
When confronted with Blue Diamond mourning by Pink Diamond's Palanquin, Greg approached her and the two started talking. In their conversation, they were able to form a connection through their shared understanding of the loss of a loved one, with Blue Diamond and Greg missing Pink Diamond and Rose Quartz respectively. However, Blue Diamond later resolved to kidnap Greg as a last resort to honor Pink Diamond's memory, and took him away in her spaceship. Blue Diamond found it surprising that a human could not only understand her pain but also relate to it.

Abilities
As a Diamond, Blue Diamond possesses abilities that far surpass any normal Gem.

Fusions
When Fused with Yellow and White Diamond, They form Black Diamond.

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. Yellow Diamond was revealed in the extended theme song.
 * Despite being a Diamond like Yellow Diamond, the cut of her gem does not exactly match her yellow counterpart, in contrast to other gems of the same type, who appear to share color and cut. However, since the two episodes they appear in were storyboarded by different members of the crew, their gemstones may only look different due to the differing art styles of the crew members, as they appear to be of the same design – a rhombus-shaped decahedron with a rhombus facet and four rectangular facets on the sides.
 * When she appears for a second time in "Steven's Dream", Blue Diamond's gemstone now appears more similar to Yellow Diamond's.
 * Blue Diamond's importance is further emphasized, as she has her own palanquin with a curtain in the front and spider legs to move it around on its own.
 * w:c:su:Rebecca Sugar has mentioned that blue colored Gems are mainly diplomats.
 * Rebecca stated that Blue Diamond's character design is meant to look "ghostly" in order to get the feeling of her mourning and draws a lot of influence from a Martha Graham's Lamentation ballet dance. Her face and hair designs are also influenced from Leiji Matsumoto's art in order to give it a "strange presence."

Cultural References

 * Blue Diamond's appearance and her throne appear to be heavily influenced by Indian and Muslim culture. Her clothing resembles that of traditional Arab wedding dress, specifically a Henna dress.
 * The frame of her throne has carved geometrical designs for windows, which are a common design in many Indian temples and houses.
 * The largest blue diamond, the Hope Diamond, also originates from India.

Gemology


Gemstone Information


 * Diamond is the official modern birthstone for April, and it is also used as an official sixty-year anniversary gemstone.
 * Diamonds are the stone of truth and victory.
 * It is associated with lightning and fearlessness, and for its properties of protection.
 * The diamond, in its rarity and beauty, is a symbol of purity and innocence, love, and fidelity, and embraces the strength of character, ethics, and faithfulness to oneself and others.
 * Diamond is the transparent, gemstone-quality crystalline form of carbon and it is indeed one of the hardest known natural substances on Earth.
 * Diamonds' hardness is the result of adamant chemical bonds between the carbon atoms.
 * There is no other gemstone in the same family as diamond, although there are a variety of very similar gemstones.
 * Diamond is pure carbon and is chemically the same as graphite.
 * Although traditional colorless or "white diamonds" are by far the most famous colored diamonds, yellow and brown diamonds are the most commonly occurring diamonds.
 * Other diamond colors include pink, red, orange, yellow, green, gray, and black.
 * Specific colors will trade under specific names.
 * Brown and yellow diamonds are often referred to as "champagne" or "cognac" diamonds.
 * If a diamond's impurities consist of boron and low level of nitrogen, the diamond will be a blue or gray color (Type IIb). Other blue diamonds are unrelated to boron; nickel or high concentrations of hydrogen are the likely causes of blue color in some diamonds.
 * The diamond is a p-type semiconductor.
 * Diamond deposits are found worldwide, the most notable being Africa, Australia, and India.
 * Approximately half of the world's diamonds come from Central and Southern Africa.
 * Canada has recently become a primary commercial source for fine white diamonds.
 * One of the most famous diamonds, the Hope Diamond, is a blue diamond, and is one of the largest diamonds ever to be cut and faceted. It is known notoriously for supposedly being cursed, depicted to bring forth misfortune to whoever attempts to wear it.
 * A notorious New Age scamming site, The Council of Love, utilizes the blue diamond as a symbol of the Virgin Mary, which may have inspired Blue Diamond's aesthetic similarities to the figure.