Grace Thompson
Blue Diamond is a character in the Steven Universe franchise. She is described as having a long ovoid face, a full upper lip, a straight nose, and large, sad, downward-slanting eyes with bold mascara on the lower lashes. She wears a long navy blue cloak and has blue irises with black diamond-shaped pupils. Blue diamonds, on the other hand, are a type of diamond that is coloured blue by trace impurities of boron within the crystalline lattice structure. They are considered a subcategory of diamonds called fancy colour diamonds and are highly sought after due to their rarity and association with royalty. Blue diamonds have been used in crowns, scepters, and royal jewellery for centuries. While there is no direct comparison between Blue Diamond from Steven Universe and a Catholic saint, both figures evoke a sense of sadness and emotional depth in their respective contexts.
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What You'll Learn
Blue diamonds are rare and valuable
Blue diamonds are a type of diamond that, aside from their colour, exhibit all of the same inherent properties as other diamonds. They are, however, extremely rare and highly coveted, known for their captivating hues ranging from faint blue to fancy dark blue. Their rarity is due to the fact that they are formed in the lower part of the Earth's mantle, and their colour is caused by trace impurities of boron within their crystalline lattice structure. The odds of finding a blue diamond in a mine are as rare as 1 to 10,000.
Blue diamonds are sourced from only a handful of mines globally. These include the Cullinan mine near Pretoria in South Africa, the Argyle mine in Australia, and historically, the renowned Golconda mine in India. The earliest recorded blue diamond, the Hope Diamond, was discovered in India in the seventeenth century.
The value of blue diamonds is based on the four Cs of Connoisseurship: colour, clarity, cut, and carat weight. Colour is considered the most important criterion for grading a blue diamond and determining its value. The most valuable blue diamonds also exhibit the highest clarity grades. The value of a blue diamond generally increases with the intensity and purity of its colour. Pure blue diamonds are the most desirable, but they are also the hardest to obtain. Blue diamonds with secondary hues of green or grey are more common and are still considered valuable, but not as desirable as their pure blue counterparts.
Blue diamonds are only considered rare and valuable if they are natural. Since the 1950s, many methods have been developed to change a diamond's appearance, including adding colour to a colourless stone. These are considered enhanced diamonds and do not have the same value or resale value as natural blue diamonds. Synthetic blue diamonds have also been created using the HPHT method.
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Blue Diamond in Steven Universe
Blue Diamond is a character in the Cartoon Network series Steven Universe. She is one of the two secondary antagonists of the series, alongside Yellow Diamond. Blue Diamond is a Gem Matriarch in Gem Homeworld and a member of the Great Diamond Authority that rules over Homeworld. She is the first of the Diamonds to be seen on-screen in an episode of Steven Universe.
Blue Diamond's appearance and her throne appear to be heavily influenced by Indian Muslim culture. Her clothing resembles that of a traditional Arab wedding dress, specifically a Henna dress. The frame of her throne features carved geometrical designs that are commonly found in many Indian temples and houses.
Blue Diamond is described as being extremely opportunistic, diplomatic, and dexterous. She is shown to be empathetic and understanding of the suffering of the Homeworld Gems caused by the Diamonds' ways. However, she is also ruthless and unforgiving towards fusions of different gems. She sentenced Ruby to be shattered just for fusing with Sapphire and mocked Garnet's fusion. She also had no qualms about locking up Steven as punishment for his actions.
In the episode "Together Alone," Blue Diamond is initially cynical and cruel to the Crystal Gems, particularly Garnet. However, after Steven challenges her beliefs, she realizes the pain she has caused Pink Diamond and decides to help Steven and his friends escape. Throughout the series, Blue Diamond develops a deep attachment to Steven, even referring to the Diamonds as his family.
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Blue Diamond's appearance
Blue diamonds are among the rarest coloured diamonds, constituting less than 0.02% of all natural mined diamonds. They are coloured blue by trace impurities of boron within the crystalline lattice structure, with nitrogen also influencing the intensity of the colour. The boron replaces some of the carbon in the diamond crystal structure, resulting in hues ranging from very light to dark blue. The most desirable blue diamonds have no secondary colour and are pure blue. However, a vivid light blue diamond may be considered less valuable than a green-blue or grey-blue diamond.
Blue diamonds are graded and classified based on the same four basic parameters as other diamonds: colour, clarity, cut, and carat weight. Colour is the most important criterion for grading a blue diamond and determining its value. The most valuable blue diamonds also exhibit the highest clarity grades. Blue diamonds with high saturation or more vivid colour are more desirable in the market.
One of the earliest mentioned blue diamonds is the Hope Diamond, a 45.52-carat fancy dark grey-blue diamond, believed to have been discovered in India, with its first recorded presence in 1666. The Mediterranean Blue is another notable blue diamond, renowned for its striking Fancy Vivid Blue colour and exceptional clarity. Mined in South Africa, this 10.03-carat diamond sold for 17,860,000 CHF ($21.5 million) in May 2025.
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Blue diamonds' historical ties to royalty
Blue diamonds have long been associated with royalty and have been used in crowns, scepters, and other royal jewelry. They are considered symbols of wealth and power. One of the earliest mentioned blue diamonds is the Hope Diamond, a 45.52-carat fancy dark grayish-blue diamond, which is believed to have been discovered in India in the 17th century. It was first recorded in 1666 by French gem merchant Jean-Baptiste Tavernier, who named it the Tavernier Blue. The Hope Diamond's last owner was famed jeweler Harry Winston, who donated it to the Smithsonian National Museum of Natural History in Washington, D.C.
Another famous blue diamond with royal ties is the Golconda Blue, which was once owned by Maharaja Yeshwant Rao Holkar II of Indore. After India gained independence in 1947, the diamond was dispersed and eventually came into the possession of Harry Winston, who reset it as a brooch. It was then resold to the Maharaja of Baroda, another renowned collector of royal jewelry. The Golconda Blue is named after the Golconda region of modern-day Telangana, India, which was famous for its mines that produced some of the world's most renowned diamonds, including the Koh-i-Noor and Darya-i-Noor.
The Wittelsbach-Graff Diamond is another blue diamond known for its historical ties to royalty. While specific details about its royal ownership are scarce, it has been sold at auctions and by renowned jewelers, indicating its value and prestige.
Blue diamonds are extremely rare, making up less than 0.02% of all natural mined diamonds. They derive their color from trace impurities of boron within their crystalline lattice structure. The rarity and historical significance of blue diamonds make them highly coveted by collectors and royalty alike.
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Grading and classification of blue diamonds
Blue diamonds are graded and classified using the same four basic parameters as other gemstones: colour, clarity, cut, and carat weight.
Colour
Colour is considered the most important criterion for grading a blue diamond and determining its value. Blue diamonds occur in hues ranging from green-blue to gray-blue, with the primary hue necessarily being blue. Green and grey are the normal secondary hues that can be found in blue diamonds. Blue diamonds are considered most beautiful and valuable when no secondary colour is present, but are pure blue. However, a pure blue diamond of light colour may be considered less valuable than a green-blue or grey-blue diamond whose colour is more vivid. The deeper and richer the colour, the more rare and thus more expensive the diamond will be.
Clarity
Blue diamonds are judged based on their appearance under 10x magnification, rather than how they would appear to the naked eye. Unlike in colourless diamonds, clarity has little effect on the diamond's value. The exception is when there is an especially high clarity on a very vividly coloured diamond, in which case the clarity can add tremendous value. There is no known blue diamond with a completely flawless (F) clarity grading, although several are known to be graded as Internally Flawless (IF).
Cut
The cut is responsible for the diamond's light performance and overall appearance, making it one of the most critical aspects of grading. Gemologists take into account various factors, including the stone's proportions, symmetry, and polish. A well-cut diamond can maximise sparkle while downplaying any coloration.
Carat Weight
The carat weight of a diamond is also considered in its grading.
Classification
Blue diamonds are classified as Type Ia or Type IIb. Type Ia blue stones contain a secondary hue and get their colour from the presence of hydrogen. Type IIb diamonds, on the other hand, contain either very few or a complete lack of nitrogen impurities.
Grading Laboratories
The three main laboratories that grade colour diamonds are the Gemological Institute of America (GIA), IGI, and HRD. The GIA has created a complex grading system that differs for each shade. Each laboratory has established its own methods and nomenclature for colour diamonds.
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Frequently asked questions
A blue diamond is a type of diamond that gets its colour from trace impurities of boron within the crystalline lattice structure. They are considered most beautiful and valuable when no secondary colour is present and the diamond is a pure blue.
Saint Diamonds is a company that creates memorial diamonds from the ashes or hair of a loved one or pet.
Blue Diamond has two noticeable and symmetrical locks of hair that curl and point inwards towards her face just below her cheekbones. She has a long ovoid face, a full upper lip, and a straight nose. She also has large, sad, downward-sloping eyes with bold mascara on the lower lashes, giving the appearance of a weeping woman.
Some famous blue diamonds include the Hope Diamond, the Idol's Eye, and the Mediterranean Blue.
