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15-408: A blue diamond is a diamond whose color is blue. Blue diamond may also refer to: Blue diamond The same four basic parameters that govern the grading of all gemstones are used to grade blue diamonds–the four Cs of Connoisseurship: color , clarity, cut and carat weight . Color is considered the most important criterion for grading a blue diamond and determining its value. However,

30-415: A crust . Mantles are made of rock or ices , and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density . All terrestrial planets (including Earth ), half of the giant planets , specifically ice giants , a number of asteroids , and some planetary moons have mantles. The Earth's mantle

45-688: A colorless stone. These are considered enhanced diamonds and do not have a natural blue diamond value or resale value. Enhanced blue diamonds are not bought with the intention of investment or eventual resale. Synthetic blue diamonds have also been made, using the HPHT method . The earliest recorded blue diamond, the Hope Diamond , was discovered in India , in the Kollur mine in the Guntur district of Andhra Pradesh (which at

60-406: A secondary hue and get their color from the presence of hydrogen. As with all diamonds, the loupe standard is used to grade clarity. This means that the inclusions are judged based on the appearance of the diamond under 10x magnification, and not how it would appear to the naked eye. Unlike in colorless diamonds, the clarity in blue diamonds has little effect on the diamond’s value. The exception

75-471: Is a layer of silicate rock between the crust and the outer core . Its mass of 4.01 × 10 kg is 67% the mass of the Earth. It has a thickness of 2,900 kilometres (1,800 mi) making up about 84% of Earth's volume. It is predominantly solid, but in geological time it behaves as a viscous fluid . Partial melting of the mantle at mid-ocean ridges produces oceanic crust , and partial melting of

90-487: Is overlain by a volcanic crust, Ganymede's ~1,315 kilometers (817 miles) thick silicate mantle is overlain by ~835 kilometers (519 miles) of ice, and Europa's ~1,165 kilometers (724 miles) km silicate mantle is overlain by ~85 kilometers (53 miles) of ice and possibly liquid water. The silicate mantle of the Earth's moon is approximately 1300–1400 km thick, and is the source of mare basalts . The lunar mantle might be exposed in

105-401: Is present but are pure blue. However, a pure blue diamond of light color may be considered less valuable than a green-blue or gray-blue diamond whose color is more vivid. The characteristic of color is very complex in blue diamonds for this reason. Most pure blue diamonds are Type IIb , meaning they contain either very few or a complete lack of nitrogen impurities. Type Ia Blue stones contain

120-428: Is when there is an especially high clarity on a very vividly colored diamond. In this case, the clarity can add tremendous value. Blue diamonds are only considered rare and valuable if they are natural. The definition of a natural blue diamond is a blue diamond that was mined with its blue color already present. Since the 1950s, many methods have been developed to change a diamond’s appearance, including adding color to

135-406: The lower part of Earth’s mantle , and that the boron creating their blue color originates from serpentinite carried down to the mantle by subducting ocean tectonic plates . Aside from the fabled curse of the Hope Diamond , blue diamonds do not yet represent a large part of world culture. However, as of 2015, blue diamonds have become the most sought-after gems at auction. This was instigated by

150-693: The mantle at subduction zones produces continental crust . Mercury has a silicate mantle approximately 490 kilometers (300 miles) thick, constituting only 28% of its mass. Venus 's silicate mantle is approximately 2,800 kilometers (1,700 miles) thick, constituting around 70% of its mass. Mars 's silicate mantle is approximately 1,600 kilometers (990 miles) thick, constituting ~74–88% of its mass, and may be represented by chassignite meteorites. Uranus and Neptune 's ice mantles are approximately 30,000 km thick, composing 80% of both masses. Jupiter 's moons Io , Europa , and Ganymede have silicate mantles; Io's ~1,100 kilometers (680 miles) silicate mantle

165-463: The most valuable blue diamonds also exhibit the highest clarity grades. There is no known blue diamond with a completely flawless (F) clarity grading, although several are known which are graded Internally Flawless (IF). One of the earliest mentioned blue diamonds is the Hope Diamond , a 45.52-carat fancy dark grayish-blue which is believed to have been discovered in India but whose first recorded presence

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180-433: The reality of the demand for fancy color diamonds over the years. In gemology, color is divided into three components: hue , saturation and tone . Blue diamonds occur in hues ranging from green-blue to gray-blue, with the primary hue necessarily being blue. Green and gray are the normal secondary hues that can be found in blue diamonds. Blue diamonds are considered most beautiful and valuable when no secondary color

195-516: The sale of the 9.75-carat fancy vivid blue "Zoe" diamond to Hong Kong billionaire Joseph Lau, who bought it for, and named it after, his young daughter, Zoe. An anthropomorphic character known as Blue Diamond is a member of the Great Diamond Authority in the TV show Steven Universe . Mantle (geology) A mantle is a layer inside a planetary body bounded below by a core and above by

210-705: The time was part of the Golconda kingdom ), in the seventeenth century. However, blue diamonds have also been discovered in the Cullinan Mine in South Africa and the Golconda region. A few blue diamonds have been discovered in the Argyle Mine in Western Australia as well, and are offered at their annual Argyle Tender when they are found. It is thought that blue diamonds, unlike most other diamonds, are formed in

225-591: Was in 1666 by French gem merchant Jean-Baptiste Tavernier , after whom it was called the Tavernier Blue . Its last owner was famed jeweler Harry Winston before he donated it to the Smithsonian National Museum of Natural History in Washington, D.C. Colorless (“White”) diamonds have remained the most popular type of diamond through the millennia, but the existence of this blue diamond so long ago affirms

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