Natural Orange Diamonds are extraordinarily rare, extremely precious, and highly coveted by connoisseurs and astute investors. This vibrant gemstone is the epitome of boldness, creativity, and success. It is second only to the pink diamond in rarity. These gems are completely natural and acquire their remarkable color from exposure to nitrogen during the formation process.
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Pure Hue Orange Diamonds Are Incredibly Rare:
Nature has bestowed upon us several fancy color diamonds with golden amber & fiery autumn hues. However, the orange in such stones is just a minor stain or color highlight. There are many orangy but virtually no orange ones in the jewelry world.
In most cases, nitrogen-related defects in their crystal lattice impart color to these stones. The divergence of color into orange or yellow is a consequence of how the nitrogen atoms group together during the diamond’s formation.
The arrangement, in the case of orange stones, is termed hyper-specific. This cut-fine alignment of atoms absorbs hints of blue & yellow from incident light. Orange color is thus born in the diamond.
The Four Nitrogen-Related Crystalline Defects:
Scientists classify these nitrogen-related defects into four fundamental groupings: cape, isolated nitrogen, the 480 nm visible absorption band, and H3.
Experts can create orange diamonds in a lab or induce orange in a normal diamond using color treatments. As such, we should correctly interpret the defects behind the color to identify naturally orange stones.
Nitrogen and diamond share near atomic radii of 155 and 170 picometer radii (Van der Waals), respectively. Furthermore, the diamond growth habitat teems with nitrogen. Consequently, a growing diamond unescapably absorbs nitrogen.
However, the mere presence of nitrogen in the diamond lattice will not synthesize an exquisite orange fancy-color diamond. Additionally, the nitrogen atoms must exist in adequate numbers. Furthermore, a specific configuration of these atoms in the lattice will be able to absorb light from the blue end of the spectrum to induce the orange color.
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Causes of Color in Orange Diamonds:
Among the four crystal lattice defects, the 480 nm visible absorption band is the first significant defect creating fancy orange diamonds.
480nm band Orange Diamond
The H3 defect often mingles with plastic deformation, like the 550 nm absorption band, to compose colors that are more orange-yellow to Orange. The intermingling of these two defects is the second significant natural process resulting in orange diamonds.
H3 Defects in a Diamond Lattice
Less frequently, the C-centers can also impart orange color to diamonds.
The Gemological Institute of America has analyzed hundreds of thousands of natural color diamonds with orange or yellow hue components during the preceding years. They found that more than two-thirds of these displayed pure, unmodified yellow hues. In sheer contrast, less than one-tenth of a percent of these gems had unmodified orange hues.
What is the Connection Between Yellow and Orange Diamonds?
Their dependence on nitrogen-related defects to produce colors closely connect Orange and yellow diamonds. In truth, a tiny shift in the transmission window in the visible spectrum differentiates the two colors. Both yellow and orange colors are kind of special to humans because they tend to be associated with happiness and warmth.
Role of Wavelength of Light:
A blend of all transmitted visible light above a particular wavelength imparts orange or yellow body colors in diamonds.
For example, nitrogen-related absorptions in the blue part of the visible spectrum at wavelengths less than ~510 nm elicit yellow. Meanwhile, absorptions extending to ~600 nm evoke Orange.
Differing crystalline defects absorb a different quantum of energy from the light spectrum. Consequently, the flaws imparting yellow are distinct from those bestowing Orange. Furthermore, the concentration levels of each defect vary from stone to stone. As a result, the absorption band shifts its wavelength location (figure 4B). In addition, plastic deformation flaws also impact the color.
Scientists have found that higher nitrogen concentrations increase the absorption and sometimes displace the transmission window into the orange region (figure 4B).
Orange color is usually not produced by cape defects.
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Why Are Both Yellow and Orange Diamonds Found All Over the World?
The profusion of nitrogen on earth and its interiors makes nitrogen easily accessible at the profound depths of diamond crystallization. Moreover, diamond atoms have a strong attraction toward nitrogen atoms. Ergo, mining areas scattered worldwide yield orange and yellow diamonds.
Diamonds with distilled Orange hues are much rarer than yellow ones. However, a few famous orange diamonds have captured the imagination of connoisseurs.
To understand the difference between orange and orangy, you should consider how a laboratory grades the diamonds. According to norms followed by labs, when the orange color within the stone is 25%-50%, it’s called an orange diamond, and when it’s 25% or less is graded as orangy.
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Like other colored diamonds, the intensity of this orange gem fluctuates from fancy light orange to fancy orange & goes up to the coveted intense orange, deep orange, and the beautiful fancy vivid orange.
Stephen C Hofer describes Pure Fancy Vivid Orange as Pumpkin Orange. Collectors who own the vivid orange gemstone of the pumpkin or cantaloupe hue know they possess one of the world’s rarest diamond treasures.
The Gemological Institute of America Laboratory seldom grades a stone “fancy orange” or ‘vivid yellow-orange” for two main reasons.
Orange is a hybrid color obtained through a mix of red and yellow. So it is normal to see strong modifiers in orange diamonds. Also, a diamond’s crystal lattice, composed of compactly connected carbon atoms, makes this gemstone extremely resistant to permeation by impurity atoms.
Orange Diamond Shapes:
Orange Diamonds Hues
Famous Orange Diamonds:
Most of these gorgeous rare gems mentioned below have acquired fame over time & are now in the collections of some of the most reputed jewelry collectors in the world.
The vivid orange, 5.54 carats Pumpkin Diamond is the most celebrated. It is an exceptionally rare exhibit.
Ronald Winston, president and CEO of Harry Winston purchased the Pumpkin Diamond in an auction at Sotheby’s for $1.3 million. A ring mounted with the Pumpkin Diamond was designed by Ronald Winston and Phillip Bloch and worn by Halle Berry at the 2002 Academy Awards, where she won the best actress. The diamond is now valued at over $3 million.
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The Koi Diamond, cut in the shape of Japan’s celebrated Koi fish, is a multi-hued orange and white diamond weighing 32 carats. The pattern of colors adds to the resemblance and makes the Koi Diamond one of the most unique fancy-colored diamonds in the world.
Another famous orange stone recently set a world record for the highest price paid per carat. This rare diamond weighs 14.82 carats. It was auctioned at Christie’s on November 12, 2013, and fetched a record $35,540,612 (the highest amount paid for an orange diamond.) It set the record for “highest price paid per carat” at $2.4 million/carat.
Actress Kelly MacDonald, nominated for best supporting actress for her role in Boardwalk Empire, attended the 2011 Golden Globe Awards with a pair of sparkling earrings encrusted with two oval orange diamonds.
Natural Orange Diamonds are emblems of commitment, vitality, creativity & humility. A gift of the same is perfect for celebrating a long-lasting relationship.
Or Learn About More Colored Diamonds As Follows:
See Also:
Fascinating Facts About Diamonds Straight From Tiffany & Co’s Chief Gemologist
