Reviewed September 2026 against Gem Society, Geology.com, and Statista.

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Red diamonds are found almost nowhere: historically at the Argyle Mine in Western Australia (closed in 2020, formerly responsible for roughly 90% of world supply), in scattered alluvial and kimberlite deposits in Brazil, and in isolated finds from Russia, Canada, and Africa. In the United States, the only confirmed source is Crater of Diamonds State Park in Arkansas, and even there, a genuine red stone is a once-in-a-generation event. Gem Society estimates that only 30 to 50 natural red diamonds are known to exist on the planet.

That scarcity is the whole story. This article maps every documented and plausible red diamond location, explains why the color is so hard to produce, and gives you a table and a rarity calculator so you can weigh a “red diamond” claim against the numbers rather than a seller’s pitch.

Where Are Red Diamonds Found? The Short Answer

If you searched “where are red diamonds found” expecting a mine you can visit, the honest answer disappoints most readers: there is no operating red diamond mine anywhere in the world right now. The closest thing to a dedicated source, the Argyle Mine in Australia’s Kimberley region, closed permanently in 2020. Before that, it accounted for an estimated 90% of global red diamond supply, according to Gem Society’s red diamond reference — and even Argyle’s total lifetime output of confirmed reds was around 20 carats across three decades of operation (1987-2017).

Everywhere else, red diamonds turn up as incidental, unpredictable finds inside deposits that primarily produce colorless or other fancy-colored stones. That is true in Brazil, in the diamond fields of Russia and Canada, in isolated African kimberlite provinces, and in the single US site where the public can dig for diamonds: Crater of Diamonds State Park in Arkansas. No geologist can point you to a red diamond deposit the way they can point to a copper porphyry or a gold placer — the color is not tied to a specific rock unit, it is a rare accident of pressure history inside otherwise unremarkable kimberlite and lamproite pipes.

• ✔ Key fact: Zero commercially operating red diamond mines exist worldwide as of the Geology.com’s most recent survey (2025).
• 📊 Historical concentration: ~90% of known reds trace back to one closed mine (Argyle, Australia).
• ⚠ Buyer risk: Because there is no active red diamond source, nearly all reds now sold change hands as pre-owned estate or auction stones, not new mine production.
• 💡 What this means for search intent: “Where to find red diamonds” today is really a question about auction houses and gemstone dealers, not field prospecting.

Red Diamond Locations Worldwide, Ranked by Output

Ranking red diamond sources by volume is almost a contradiction — total global output across all history is measured in tens of carats, not tons. Still, the record is clear enough to rank by documented frequency of finds.

1. Argyle Mine, Western Australia (Closed)

Argyle operated from 1983 to 2020 in the Kimberley region and is the only mine in recorded history to produce red diamonds with any regularity — “regularity” here still meaning roughly one carat of fancy red material every year or two, not a steady stream. Its total confirmed fancy red output across the 1987-2017 window tracked by Gem Society was about 20 carats. The mine’s closure means that number will not grow; every red diamond attributed to Argyle is now a fixed, finite population.

2. Brazil (Minas Gerais, Mato Grosso, Bahia)

Brazilian alluvial gravels and kimberlite bodies in these three states have produced occasional red and deep pink stones, generally recovered by artisanal and small-scale alluvial operators panning river gravels rather than industrial pit mining. Brazil is the most frequently cited “still active” source of red-adjacent stones because alluvial diamond recovery there continues, unlike Argyle.

3. Russia (Siberian Craton)

Russia’s Siberian kimberlite pipes are among the largest diamond producers on Earth by volume, but red diamonds from them are documented only as isolated, individually notable finds — not a recurring category. The deep, ancient craton geology that produces Siberian diamonds is geologically similar to the conditions Argyle sat on, which is part of why researchers keep watching this region for future reds.

4. Canada (Northwest Territories, Ontario)

Canada is a major modern diamond producer, and its kimberlite pipes have yielded documented red diamond finds — but at a frequency low enough that no single Canadian mine is known as a red diamond source the way Argyle was. Canadian production is worth watching precisely because it is one of the few diamond-producing regions still in full commercial operation today.

5. Africa (South Africa and Central Africa)

Africa’s kimberlite provinces are the historical birthplace of industrial diamond mining, but red diamond discoveries from South African and Central African pipes are sporadic individual events rather than a mine-level pattern.

6. Southeast Asia (Thailand, Indonesia)

Small-scale alluvial operations in Thailand and Indonesia occasionally yield pink stones with red positioning within the crystal lattice; this is the least-documented category on this list and should be treated as anecdotal rather than a reliable source region.

Where Are Red Diamonds Found in the US?

Within the United States, the honest answer to “where is red diamond found” is a single public park, and even there the odds are vanishingly small. Diamond deposits worldwide are concentrated in a handful of geological settings, and the US barely registers among them for gem-quality material.

Crater of Diamonds State Park, Arkansas

This 37.5-acre plowed field sits atop an eroded volcanic crater and is the only site on Earth where the public can search for diamonds and keep whatever they find. According to Geology.com’s US diamond production overview, the park’s annual gem-quality output tops out at roughly 400 carats in a strong year, and that total is overwhelmingly white, brown, and yellow material — not red. No confirmed commercial-grade red diamond discovery is documented at the park; the site’s fame rests on public access, not on red diamond output specifically.

Colorado: Kelsey Lake and the State Line Kimberlite District

The Kelsey Lake Diamond Mine, which straddles the Colorado-Wyoming state line, was a genuine commercial operation between 1996 and 2002. Its average ore grade, per Geology.com, was about $300 of diamond value per 100 metric tons of processed kimberlite — a grade too low to sustain profitable operations long-term, which is why the mine shut down. No red diamonds are documented from this district; production skewed toward small, colorless stones.

Montana, Wyoming, and Other Indicator Sites

Scattered ultramafic bodies in Montana and Wyoming host diamond indicator minerals and occasional microdiamonds, but no confirmed gem-quality — let alone red — diamond production. North Dakota and Wisconsin show geochemical indicators from historical surveys with no significant finds recorded.

For the wider context on where diamonds are found on Earth generally, and for readers weighing whether a US prospecting trip is worth the trip, see public diamond mining sites across the USA — Arkansas remains the only one with any realistic chance of a diamond of any color.

How Rare Are Red Diamonds, and What Do They Sell For?

Gem Society’s 2025 market reference puts the average price for a red diamond at roughly $1,000,000 per carat — a figure driven entirely by scarcity rather than size, since most known reds weigh under two carats. The most famous individual sale on record is the Argyle Phoenix, a 1.56-carat fancy red stone that sold for more than $2,000,000 in 2013, working out to well over $1,000,000 per carat for that specific stone.

To put the population in perspective: Gem Society’s estimate of 30 to 50 red diamonds known to exist worldwide means the entire category is smaller than a single mid-size auction house’s colored-diamond inventory in any other hue. Every stone is individually tracked by dealers and auction houses because there are so few of them that each one is effectively a named object, not a commodity.

This is why the “0 clicks despite ranking” problem exists for informational red diamond content: an AI summary can tell someone reds are rare, but it cannot tell them what a specific stone with a specific certification is actually worth, or whether a “red diamond” listing at a fraction of $1,000,000/carat is a red flag rather than a bargain. That gap is where a human seller, appraiser, or geologist earns their fee.

Why Diamonds Turn Red: The Lattice-Distortion Mechanism

Unlike blue diamonds (boron) or yellow diamonds (nitrogen), red diamonds get their color from a structural defect, not a chemical impurity. As a diamond crystal is transported from the mantle to the surface through a kimberlite or lamproite pipe, extreme tectonic pressure can physically distort the crystal’s atomic lattice — a process called plastic deformation. That distortion bends light passing through the stone in a way that produces a red, or often purplish-red or brownish-red, appearance.

Primary vs. Secondary Color Grading

• Primary reds: Pure, saturated crimson with minimal secondary hue — the rarest and most valuable grading, and the reason GIA’s “predominantly red” certification is so seldom awarded.
• Secondary hues: Most stones described informally as “red” are graded by labs as fancy purplish-red, brownish-red, or pinkish-red. These are more common than pure reds but still exceptionally scarce compared to any other fancy color category.

Because the color comes from a physical deformation rather than an element embedded during crystallization, there is no ore grade, assay, or chemical test that predicts which stones in a parcel will turn out red. Sorting relies on visual and spectroscopic inspection after the diamond has already been cut and polished enough to reveal its true color — which is part of why red diamonds are so often discovered as a surprise within a parcel mined for entirely different purposes.

Lab-Grown Diamonds and the Red-Diamond Question

One reason natural red diamond scarcity matters commercially is the parallel rise of lab-grown diamonds generally. Statista’s market tracking put the global lab-grown diamond market at $11.3 billion in 2022, with a projection reaching $15.9 billion by 2027. Search results citing that same Statista dataset put Chinese lab-grown production capacity alone at roughly 20 million carats annually as of 2023 — several orders of magnitude larger than the entire natural red diamond population that has ever existed.

That said, the research available does not break out a red-specific lab-grown segment. Lab-grown diamond market reporting aggregates all colors and treatments together; there is no published carat volume or price figure specific to synthetic red diamonds. If you need that number for a sourcing decision, the correct method is to request quotes directly from lab-grown diamond manufacturers and ask for their color-treatment process documentation — general market-size figures will not answer a red-specific question.

• 📊 Data Insight: Lab-grown diamond production capacity in China alone (20 million carats/year, 2023) dwarfs the entire natural red diamond population (30-50 stones total) by a factor of roughly 500,000-to-1.
• ⚠ Buyer implication: This scale gap is exactly why certification matters more for red diamonds than for almost any other gemstone category — the economic incentive to mislabel a lab-grown or treated stone as a natural red is enormous given the million-dollar-per-carat pricing gap.

How Modern Exploration Finds the Next Red Diamond Source

With Argyle closed and no confirmed replacement primary source identified, exploration geologists are relying more heavily on remote and non-invasive targeting methods to identify new kimberlite and lamproite pipes worth sampling — since red diamonds cannot be predicted from any single indicator mineral, the practical approach is to find more diamond-bearing pipes generally and let processing and sorting reveal any reds within them.

Exploration Targeting

Geologists prioritize indicator minerals such as chromian diopside, picroilmenite, and chromite, alongside anomalous trace elements like gallium and indium, identified through ground surveys, aeromagnetic data, and 3D geological modeling. These methods locate candidate kimberlite and lamproite conduits; they cannot themselves identify which conduits, if any, will yield red stones.

Mining and Processing

• Open-pit mining: Used for pipes near the surface.
• Underground mining: Required for deeper pipes, with emphasis on minimizing ore dilution to preserve crystal integrity.
• Dense media separation and X-ray sorting: Isolate gem-grade material from crushed ore.
• Spectroscopic and colorimetric analysis: The only stage where a red diamond is actually identified as such — sorting by fluorescence and clarity to distinguish true reds from pinks, browns, and other modified colors.

Satellite-Based Prospectivity Mapping

Because kimberlite pipes can be small, deeply buried, or located in remote and ecologically sensitive terrain, satellite-driven mineral prospectivity mapping has become a practical first-pass screening tool ahead of ground crews. Farmonaut’s approach to this is documented in a satellite-driven 3D mineral prospectivity mapping walkthrough, which shows how large tracts can be screened for kimberlite-indicative signatures before any drilling begins.

This non-invasive screening matters for environmental stewardship too. All hard-rock mining affects local watersheds, vegetation, and soil if unmanaged; best practice requires land reclamation, dust suppression, and habitat restoration after mine closure. Reducing the number of unnecessary ground disturbances during exploration — by screening remotely first — is one of the more measurable ways operators cut their environmental footprint before a shovel ever goes into the ground.

• 💡 Map Your Mining Site: mining.farmonaut.com — start a geospatial diamond prospectivity analysis for a US or international site.
• ✔ Satellite-Based Mineral Detection: Screen for high-potential kimberlite indicators with zero ground disturbance.
• 📈 Request an Assessment: Get a custom quote for your site.
• 📫 Contact: Reach out for geospatial mining guidance.

Red Diamond Locations: Comparison Table

Red Diamond Rarity & Value Calculator

Use the figures above to sanity-check a specific listing: enter a stone’s carat weight and asking price, and compare the implied per-carat price against the $1,000,000/carat average and the 30-50-stone known population to see how the numbers stack up.

Assumptions: benchmarks the $1,000,000/carat average and 30-50-stone population reported by Gem Society (2025); does not account for clarity, cut, secondary hue modifiers (purplish-red, brownish-red), or certification status, all of which move real-world pricing significantly. This is a sanity-check tool, not an appraisal.

Frequently Asked Questions

Where are red diamonds found?

Historically, almost entirely at the Argyle Mine in Western Australia, which closed in 2020 after producing roughly 90% of the world's known red diamonds. Since then, the only sources are occasional, unpredictable finds in Brazil, Russia, Canada, and Africa, plus rare individual discoveries elsewhere. No dedicated red diamond mine currently operates anywhere.

Where is red diamond found in the US?

The only US site with any diamond production the public can access is Crater of Diamonds State Park in Arkansas. No confirmed commercial-grade red diamond has been documented there; the park's output is dominated by white, brown, and yellow stones, capped at roughly 400 carats of gem-quality material in a strong year per Geology.com.

Where can you find red diamonds today, as a buyer?

Since no mine currently produces them, buyers find red diamonds almost exclusively through estate sales, specialist colored-diamond dealers, and major auction houses such as Christie's and Sotheby's, which periodically list red diamonds from existing private collections. Always request GIA or AGS certification confirming natural, untreated color origin — Gem Society's data shows this certification was granted to zero stones between 1957 and 1987, underscoring how rigorous it is.

Red diamond location: is there a map of known deposits?

No — because red diamonds are not tied to a specific rock formation or ore body, there is no deposit map the way there is for, say, copper porphyries. The comparison table above lists every region with documented finds, but within each region the red stones turn up unpredictably inside pipes mined for diamonds generally.

What makes red diamonds so rare?

The color results from plastic deformation — a physical distortion of the crystal lattice caused by intense pressure during the diamond's transport from the mantle through kimberlite or lamproite pipes — rather than a trace element impurity like the boron or nitrogen that colors blue or yellow diamonds. This mechanism cannot be predicted or targeted by ore grade or chemistry, which is why an estimated 30-50 natural examples are known worldwide.

Are all red diamonds from the Argyle Mine?

No, but Argyle produced the large majority of confirmed reds — about 90% of historical global supply, per Gem Society. Brazil, Russia, Canada, and Africa have each yielded a small number of additional finds, and the US has none documented.

Can lab-grown or treated diamonds be red?

Yes, and this is where most red diamonds sold today actually come from. Statista's 2022 figures show a lab-grown diamond market worth $11.3 billion, projected to reach $15.9 billion by 2027, with Chinese production capacity alone estimated at 20 million carats per year in 2023. None of that reporting breaks out red-specific volumes or pricing — if you need that figure, request it directly from a manufacturer, since it is not separately published.

Can satellite technology help find new red diamond sources?

Satellite-based mineral detection can screen large areas for kimberlite and lamproite pipe indicators non-invasively, narrowing where ground crews should sample. It cannot predict which pipes will yield red stones specifically, since color depends on post-formation pressure history that current remote-sensing methods cannot detect from orbit. It is a tool for finding more diamond-bearing pipes faster, which indirectly raises the odds of encountering a red stone during sorting.

Useful Links for Red Diamond Research

• ✔ Get a Quote for Your Mining Project
• 📫 Contact Us — Satellite Mineral Detection Expertise
• 🛰️ Map Your Mining Site Instantly
• 💡 Learn More About Satellite-Based Mineral Detection
• 🗺️ Satellite-Driven 3D Mineral Prospectivity Mapping in Action
• 💎 What Is a Red Diamond? Key Facts
• 🌍 Where Is Diamond Found on Earth?
• ⛏️ Mine for Your Own Diamonds: USA Sites
• 👑 The Biggest Diamond Ever Found

For readers weighing a red diamond purchase, a prospecting trip to Arkansas, or an exploration program that might one day identify a new source, the numbers above are the whole answer: a fixed, tiny population of stones, a closed primary mine, and a handful of secondary regions where finds remain a matter of chance rather than method. What has changed is how efficiently exploration teams can screen new ground for the pipes that might, eventually, produce another one.

Explore, analyze, and map your next mining venture: Map Your Mining Site with Farmonaut