Blue diamond is a type of diamond which exhibits all of the same inherent properties of the mineral except with the additional element of blue color in the stone. They are colored blue by trace amounts of boron that contaminate the crystalline lattice structure. Blue diamonds belong to a subcategory of diamonds called fancy color diamonds, the generic name for diamonds that exhibit intense color.
Properties determining value
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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.[2] However, the most valuable blue diamonds also exhibit the highest clarity grades.[3] There is no known blue diamond with a completely flawless (F) clarity grading, although several are known which are graded Internally Flawless (IF).[4]
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 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.[5] 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 the reality of the demand for fancy color diamonds over the years.
Color
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In gemology,[6] 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 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.[2][7] 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 a secondary hue and get their color from the presence of hydrogen.[8]
Clarity
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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.[4] Unlike in colorless diamonds, the clarity in blue diamonds has little effect on the diamond’s value. The exception is when there is an especially high clarity on a very vividly colored diamond. In this case, the clarity can add tremendous value.[9]
Treatments
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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.[10] Since the 1950s, many methods have been developed to change a diamond’s appearance, including adding color to a colorless stone. These are considered enhanced diamonds and do not have a natural blue diamond value or resale value.[11] 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.[12]
Blue diamond mines
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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 the time was part of the Golconda kingdom), in the seventeenth century.[13][14][15] However, blue diamonds have also been discovered in the Cullinan Mine in South Africa and the Golconda region.[10] 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.[16] It is thought that blue diamonds, unlike most other diamonds, are formed in 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.[17]
Blue diamonds in popular culture
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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 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.[18]
An anthropomorphic character known as Blue Diamond is a member of the Great Diamond Authority in the TV show Steven Universe.
Notable blue diamonds
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Gallery
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The Hope Diamond
The Hope Diamond without lighting
Synthetic blue diamond bracelet
See also
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References
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Further reading
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Blue, diamonds are some of the rarest stones out there, with lots of stories to tell. Here’s the lowdown on these big blue beauties!
The blue diamond is a precious stone with rare qualities. People consider this color to be a symbol of eternity, truth, devotion, peace, chastity and spirituality. If you’re more into Hollywood, one of the most expensive diamonds in the world was the grayish blue one owned by Elizabeth Taylor.
What are Blue Diamonds?
A blue diamond is everything the name tells you. It’s as rare as any colorful diamond – from pink, to violet and red – but its deep shade brings lots of popularity, as does its size. The darker and bigger, the higher the price.
This diamond is mysterious and has a lot of controversies around it. Some people think it’s not a natural diamond color, but nature creates blue diamonds. Like the rest of the diamonds, its value is set by color, intensity, size and cut.
It takes millions of years for heat and carbon to turn into this precious stone. The color is set by elements like boron and nitrogen. It is expensive and you can’t find it in a lot of places, some are in South Africa and Australia, with vintage ones coming from India.
“Hope Diamond”, “The Imperial Blue” and the “Blue Moon of Josephine” are some of the most expensive diamonds ever bought. This color has broken a lot of records. And the prices will continue to rise as the demand increases and the supply decreases. And that’s where lab made and treated diamonds come into to play.
Don’t worry if you have a budget to respect. There are plenty of beautiful man-made blue diamonds that will still turn heads. In addition, being friendly with Mother Earth and also trying to deliver a special present has never been easier.
Man-made diamonds are actually white diamonds that have gone through a coloring treatment brought on by heat. They start out as white diamonds that some people don’t care for, because they aren’t actually white. As a result, they lose their value. But the coloring process can produce a variety of gorgeous shades. Lab made ones follow the natural process of creating diamonds. The only differences being that it’s faster, and safer for the environment.
The blue diamond makes a wonderful center piece on an engagement ring, as well as on a wedding band. But, if you want something blue that isn’t a diamond, opt for gemstones like blue sapphire, blue topaz, blue spinel and aquamarine. By the way, they can also go well together if you want to mix and match on a friendly budget. Check out our collection and find the perfect fit for your shade of blue.