Mined Diamonds
Natural diamonds formed billions of years ago under extraordinary conditions deep within the Earth. Understanding their origins and journey to the surface.
How Mined Diamonds Form
Natural diamonds formed between 1 and 3 billion years ago, approximately 100 miles or more below the Earth's surface. Under extreme pressure (around 50,000 atmospheres) and temperatures of 2,000°F or higher, carbon atoms crystallized into the cubic structure we recognize as diamond. These ancient crystals were later brought to the surface through violent volcanic eruptions.
Ancient Origins
Mined diamonds are among the oldest materials on Earth. They formed in the Earth's mantle during a time when the planet was still geologically young. Most natural diamonds are between 1 billion and 3.5 billion years old.
These diamonds remained deep underground until volcanic eruptions—occurring between 300 million and 20 million years ago—carried them to the surface through vertical pipes of volcanic rock called kimberlite pipes. This is where most diamond mines are located today.
From Mine to Market
Exploration & Mining
Geologists search for kimberlite pipes and other diamond-bearing formations. When viable deposits are found, mining operations extract rough diamonds from the earth through open-pit or underground mining methods.
Sorting & Evaluation
Rough diamonds are sorted by size, shape, quality, and color. Only a small percentage of mined diamonds are gem-quality; most are used for industrial purposes due to inclusions or other characteristics.
Cutting & Polishing
Skilled artisans plan each diamond's cut to maximize beauty while retaining carat weight. The cutting and polishing process can take hours to weeks depending on the stone's complexity.
Certification & Sale
Finished diamonds may be submitted to gemological laboratories for grading. The 4Cs (Cut, Color, Clarity, Carat) are evaluated and documented before the diamond enters the marketplace.
Major Diamond Sources
Diamonds have been discovered on every continent, but commercial mining operations are concentrated in several key regions. Each source produces diamonds with subtly different characteristics.
Major diamond-producing countries include Russia, Botswana, Canada, Angola, South Africa, and the Democratic Republic of Congo. Australia, Namibia, and other nations also contribute to global production.
Marine diamonds—those eroded from kimberlite pipes and deposited along coastlines over millions of years—are recovered from ocean floors in places like Namibia.
Environmental Impact of Diamond Mining
Diamond mining is one of the most earth-intensive extraction processes. Understanding the environmental footprint helps consumers make informed choices about their jewelry purchases.
- Approximately 250 tons of earth must be moved to recover a single carat of gem-quality diamond
- Open-pit mining creates massive craters, some visible from space — such as the Mirny mine in Russia
- Mining operations can divert rivers and contaminate groundwater with chemicals used in processing
- Habitat destruction affects local wildlife and ecosystems for decades after mining concludes
- Communities are sometimes displaced to make way for mining operations
The industry has made improvements in recent years, but the fundamental environmental footprint of diamond mining remains significant. This is one reason many conscious consumers are choosing lab-grown alternatives that deliver the same beauty without the ecological cost.
Frequently Asked Questions
Mined diamonds form deep in the Earth's mantle, approximately 100-150 miles below the surface, where extreme pressure (45-60 kilobars) and temperature (900-1,300 degrees Celsius) cause carbon atoms to crystallize into diamond. This process occurs over 1-3 billion years. Volcanic eruptions bring diamonds to the surface through kimberlite pipes.
The largest diamond-producing countries are Russia (approximately 30% of global production), Botswana, Canada, Angola, South Africa, and the Democratic Republic of Congo. Australia, Namibia, and Lesotho are also significant producers. Each region produces diamonds with slightly different characteristics.
Most natural diamonds are between 1 and 3.5 billion years old. The crystallization process itself occurs over millions of years under sustained high pressure and temperature deep in the Earth's mantle. The oldest diamonds are nearly as old as the Earth itself (4.5 billion years).
The Kimberley Process has significantly reduced conflict diamond trade, but concerns remain about labor conditions, environmental damage, and human rights in some mining regions. For guaranteed ethical sourcing with complete traceability, many consumers choose lab-grown diamonds.
Mined and lab-grown diamonds are chemically, physically, and optically identical. Both are pure carbon in diamond crystal structure, rated 10 on the Mohs scale. The only difference is origin: mined diamonds formed in the Earth over billions of years, while lab-grown diamonds are created in laboratories over weeks. Lab-grown diamonds cost 40-60% less.
Explore Our Collection
Learn about our lab-grown diamonds—real diamonds with the same properties as mined stones.
Continue Learning: Lab Grown Diamonds · Lab vs Mined · Conflict-Free · The 4Cs