Diamond Ore in Real Life: Kimberlite, Grade and Mines

Is diamond an ore? The short answer

In real life, diamond is a mineral, and the “diamond ore” miners dig is the rock that holds it, usually a volcanic rock called kimberlite, or the gravel that rivers and seas carried diamonds into. An ore is simply rock that can be mined at a profit for the mineral inside it. Diamond ore is very low grade: at Gahcho Kué in Canada the plant recovered 1.23 carats per tonne of ore in 2025 (100% basis), and at Karowe in Botswana the recovered grade was 12.2 carats per hundred tonnes in the last quarter of 2025.

A carat is 0.2 gram (the metric carat). So a tonne of Gahcho Kué ore holds about a quarter of a gram of diamond, and the rest is rock that has to be crushed, screened and sorted. This page explains what real diamond ore looks like, how rich it is, where it is mined, whether you can dig it yourself, and what is changing in the industry.

Diamond ore in real life versus Minecraft

Many searches for this phrase come from players. In the game, diamond ore is a rare block found deep underground that drops diamonds when mined. Real deposits work very differently:

• No visible blocks. Real diamonds are tiny crystals scattered through rock. You cannot spot a vein of them from the surface.
• Grade is measured in carats per tonne. One tonne of ore gives a fraction of a gram to a few grams of diamond at best, not a stack of gems.
• No ingots. Diamond is pure carbon, so there is nothing to smelt. Miners recover whole crystals by crushing and sorting.
• Depth is not where you dig. Diamonds formed in the mantle, but mines work kimberlite pipes that carried them up to the surface, from open pits near the top to underground workings below.

What diamond ore looks like in real life

Kimberlite is a volcanic rock, and the diamonds in it are mostly small crystals. Most diamonds are brown or yellow, and a typical rough crystal is an octahedron, a shape like two pyramids joined at the base. Rough diamond is uncut and does not sparkle like a polished gem.

At the original Kimberley mines in South Africa, the weathered top of the rock was coloured yellow by iron minerals and miners called it “yellow ground”. Deeper, fresher rock is “blue ground”, which is harder and has to be crushed. Both are described in the kimberlite reference entry. Rock from a second source, lamproite, can also hold diamonds but is less common.

Diamond is the hardest known natural mineral, ten on the Mohs scale, and it is made only of carbon. It did not form from coal. Most mined diamonds came from the mantle roughly 150 kilometres or more below the surface and were carried up in rare, fast volcanic eruptions.

How much diamond is in diamond ore

Grade tells you how rich the rock is, and it varies widely from mine to mine. The two recent figures above sit more than ten times apart: 1.23 carats per tonne at Gahcho Kué (a 2025 full-year figure) against about 0.12 at Karowe (the Q4 2025 figure, with quarters in 2025 between 12.2 and 13.4 carats per hundred tonnes). A low grade can still pay if the stones are large or valuable. Karowe is known for very large stones; in 2025 it recovered 31 stones over 100 carats, including three above 1,000 carats.

Price matters as much as grade. There is no internationally set price for rough gem diamonds. Producers sell at regular “sights” and the price depends on the size, shape, colour and clarity category. The world average for 2024 was US$88.35 per carat (Kimberley Process data via Natural Resources Canada, preliminary), while De Beers reported a 2025 average realised price of US$142 per carat and Mountain Province an average of US$59 per carat for the same year.

Use the calculator below to see how grade, price and operating cost combine. The numbers are examples, not forecasts, and the cost is only an example, so replace each one with your own.

Where diamond ore is mined

Seven countries produced 96% of the world’s rough diamonds by volume in 2024, according to Natural Resources Canada’s summary of Kimberley Process data. Russia led with 34.6%, then Botswana, Angola, Canada and the Democratic Republic of the Congo. Ranked by value, the order changes: Namibia makes up about 10% of world value from only 2.1% of the carats, while the Democratic Republic of the Congo adds only 1.1% of value from 9.1% of the carats a pattern consistent with USGS data showing the Congo (Kinshasa) is a leading producer of natural industrial-grade diamond.

Chart

Volume versus value, 2024

Per cent of world total, same eight countries

Chart

Share of world rough diamond carats, 2024

Per cent of world volume, top eight producers

World output has fallen. It peaked near 150.9 million carats in 2017 and was 107.9 million carats in 2024, worth US$9.5 billion. Canada alone made 13.3 million carats in 2024, down 17% on 2023, and NRCan expects its production to keep trending down as mines age.

Only about 20% of world diamond production by weight goes to jewellery; the other 80%, called bort, is used industrially. Almost all industrial diamond now comes from factories: USGS says natural diamond is under 1% of all industrial diamond used, and about 97% of US industrial diamond consumption is synthetic.

Can you dig real diamond ore yourself

In one place, yes. At Crater of Diamonds State Park in Arkansas, visitors search a 37-acre plowed field that is the eroded surface of a volcanic crater, and any diamond you find is yours to keep. Park records say visitors have found more than 37,377 diamonds since 1972 (to January 2026), in white, brown and yellow. The biggest was the 40.23-carat Uncle Sam. The park describes itself as the only place where the public can search for natural diamonds in their original volcanic source.

Elsewhere you need a licence or claim, landowner permission and the right equipment, and diamond deposits are rare. If you wonder whether a state with no known pipe could hold one, read can you find diamonds in Arizona. Always get permission before you prospect, follow local safety rules and never use mercury.

How diamond ore is mined and sorted

Three methods dominate:

• Open pit works kimberlite pipes near the surface. Karowe is an open-pit mine, per Lucara’s 2025 results.
• Underground takes over when the pit gets too deep. Karowe’s shafts reached final depth in 2025 as part of its underground project, and Ekati in Canada mines the Misery pipe underground under Burgundy Diamond Mines’ life-of-mine plan.
• Alluvial and marine recover diamonds that rivers or the sea moved away from their source. Namibia’s offshore vessels are the best-known example.

The ore is crushed, screened and sorted by density, X-rays and optical sensors, so diamonds can be taken out before they are damaged. Water use, tailings and land disturbance are the main environmental concerns, and mines are usually required to plan closure and rehabilitation.

▶ Farmonaut explainer in clay: the seven environmental impacts of mining. · 2:31

Diamond mining trends to watch

These trends come from company and government reports, not forecasts:

Chart

World rough diamond production, 2015 to 2024

Million carats

• Smaller supply. De Beers cut its 2026 production guidance to 21 to 26 million carats (100% basis) from 26 to 29 million, reacting to weak trading conditions (report of 5 February 2026).
• Lab-grown competition. NRCan names growing competition from lab-grown diamonds as one reason for weaker demand for natural stones.
• Underground mining. Older open pits are moving underground, as at Karowe and Ekati.
• Ownership change. Anglo American is running a sale process for De Beers.
• Ethical sourcing rules. Producers certify rough diamonds under the Kimberley Process, and world production statistics arrive well after the year ends: the Natural Resources Canada page updated in February 2026 still shows 2024 as the latest, preliminary year.

How satellites help look for kimberlites

Satellites cannot see diamonds. Kimberlite pipes are small, often under cover, and are usually found by a mix of geophysics (magnetic, electromagnetic and gravity surveys), sampling of indicator minerals and drilling. Satellite images can help map landforms, structures and drainage before the field team goes out, which narrows the area to check. Farmonaut offers satellite-based mineral detection for early screening; results are exploration targets, not a resource estimate. To ask about a project, use the mining query form or contact us.

▶ Farmonaut explainer: remote sensing for mining in plain words. · 2:01

Frequently asked questions

What is diamond ore?

It is the rock mined for its diamonds, most often kimberlite from a volcanic pipe, or river and marine gravel. Diamond is the mineral; the rock around it is the ore.

Is a diamond an ore?

No. A diamond is a mineral made of carbon. An ore is the rock that holds a mineral in amounts worth mining.

What does diamond ore look like?

Kimberlite is a volcanic rock, weathered to yellow ground near the surface at Kimberley. The diamonds in it are mostly small crystals, and most are brown or yellow.

How much diamond is in a tonne of ore?

Typically well under a few carats. Gahcho Kué recovered 1.23 carats per tonne in 2025, and Karowe about 0.12 in the last quarter of 2025. A carat is 0.2 gram.

Where is diamond ore found?

In 2024 Russia, Botswana, Angola, Canada, the Democratic Republic of the Congo, South Africa and Zimbabwe made 96% of world volume. Diamond deposits have been found in more than 35 countries, says USGS.

Is there diamond ingot in real life?

No. Diamond is a pure carbon crystal and is not smelted. Miners recover whole crystals from crushed ore.

Can you find diamonds in the United States?

Yes, at Crater of Diamonds State Park in Arkansas, where visitors keep what they find.

Why are diamonds mined from kimberlite pipes?

Kimberlite magma rose quickly from the mantle and carried diamonds with it. That fast ascent is why some of them survived.

Is diamond ore the same as the diamond in industry?

Not mostly. Natural diamond is under 1% of the industrial diamond used, according to USGS; the rest is synthetic.

How much is a carat of rough diamond worth?

It depends on quality. The world average in 2024 was US$88.35 per carat, De Beers averaged US$142 per carat in 2025 and Mountain Province US$59.

How is diamond ore found?

Geologists use geophysical surveys, indicator-mineral sampling in streams and soils, and drilling. Satellite images can help with early mapping.

Not investment advice.