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Forged Under Extreme Pressure, The Winston Red Is The Rarest Red Diamond On The Planet — And It Can Now Be Seen Up Close At The Smithsonian Museum.
It shines like fire trapped in stone. Weighing 2.33 carats and a red so pure it seems impossible. The rarest diamond in the world finally reveals some of its secrets after decades of mystery and fascination.
At the center of one of the most prestigious showcases in the Smithsonian National Museum of Natural History, a small 2.33-carat stone attracts glances as if it were on fire.
The intense, reddish glow of the so-called Winston Red makes it seem as if the Earth itself is pouring light from within.
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But this jewel impresses not just with its beauty: it is the rarest type of diamond known — a pure “fancy red,” with no trace of any other color. A mystery that is now beginning to be deciphered.
A Red Glow That Science Took Decades To Understand
The Winston Red does not owe its color to chemical elements, as is the case with blue or yellow diamonds. Instead of boron or nitrogen, what causes the intense red coloration is plastic deformation. This means that extreme pressure and intense heat beneath the Earth’s crust created distortions in the crystal structure.
These distortions are not visible to the naked eye. They affect how light interacts with the stone, particularly around the wavelength of 550 nanometers — which produces the vibrant red hue. According to researchers from the Smithsonian and the Gemological Institute of America (GIA), these specific absorption characteristics, combined with nitrogen-related defects known as N3, H3, and H4, create the balance that makes this gem so unique.
Additionally, the Winston Red contains no additional shades of brown, orange, or purple, which ensures its classification as “fancy red.” Only one in every 25 million diamonds evaluated by the GIA achieves this level of color purity.
From Maharaja to Museum: The Journey of The Stone
The story of the Winston Red begins in 1938, in London. At the time, the jewel was still known as “Raj Red.” It was sold by Jacques Cartier to the Maharaja of Nawanagar, Digvijaysinhji. Cartier suggested that it be set into a necklace alongside other colored diamonds.
The necklace was indeed assembled — and it was grand. Called the Nawanagar Ceremonial Necklace, it included over 600 carats of gemstones. Photographs from 1947 show the maharaja holding the necklace, with the red diamond at its center, radiating its ruby glow.
Decades later, the necklace was disassembled, and the stone disappeared from public view.
It reappeared only in 1988, when Ronald Winston, heir to the Winston House, purchased the gem from the maharaja’s son. It resurfaced in 1989 in Tokyo, worn by Brooke Shields at an event.
In 2023, the diamond was donated to the Smithsonian by Ronald Winston. The jewel was given the definitive name Winston Red and was exhibited in the Winston Gallery, alongside another 40 stones from the Winston Fancy Color collection.
Tracing The Origin Within The Earth
The history of the Winston Red in human hands is well known. But its geological origin remains shrouded in uncertainty.
The gem’s cut, in old mine brilliant style, indicates that it was polished before the mid-20th century. Spectroscopic analysis revealed that it belongs to the IaAB Group 1, which includes most red and pink diamonds. These diamonds are rich in nitrogen and show strong internal distortions.
By comparing the spectroscopic fingerprints of the Winston Red with hundreds of other similar stones, researchers narrowed its origin down to Brazil or Venezuela.
These countries have deposits known for extreme geological conditions capable of generating this unique color transformation.
Even so, there is no absolute confirmation. The scientists themselves admit that the geology of these regions is still under-researched.
So Rare That Imperfections Are Ignored
Despite its impressive sparkle, the Winston Red has internal flaws and visible chips along its girdle. Its purity has been classified as I2 — which, in other gems, would significantly reduce the value. But in the case of red diamonds, this assessment loses weight in light of the extreme rarity.
According to GIA data, only 0.04% of diamonds analyzed as “Fancy Color” receive the “Fancy Red” classification. And among these few, only 4% weigh more than two carats. In other words, a red diamond over two carats with pure color is practically a geological anomaly.
“The lower clarity of extravagant red diamonds is of little concern compared to the coveted red color,” say GIA experts.
A Rarity Open To The Public
The only “Fancy” red diamond larger than the Winston Red in public records is the Moussaieff Red, weighing 5.11 carats, appraised at US$ 7 million. But the Moussaieff is in private hands. The Winston Red can be visited by anyone in Washington, on display at the Smithsonian.
Ronald Winston, in donating the piece, stated that the delivery to the museum symbolizes the achievements of his life. “I am very happy to share this collection with the Institution and museum visitors,” he declared.
Curator Gabriela Farfan emphasized the diamond’s importance for educational and scientific purposes. “These gems give us the opportunity to share with our visitors the full range of colors in which diamonds occur.”
With its unparalleled color and origin still shrouded in mystery, the Winston Red now shines for all who pass through the museum. A rare reminder of what the Earth is capable of creating when time, pressure, and chance combine perfectly.
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