How Diamonds Form in Nature
Billions of years, immense heat, crushing pressure — the remarkable natural story of a diamond.
Before labs could grow diamonds in weeks, nature took its time — a very, very long time. Understanding the natural process makes it clear why lab grown diamonds are the same material, just made faster.
Deep beneath the surface
Most natural diamonds formed 1–3 billion years ago, roughly 90–120 miles down in the Earth's mantle. There, carbon was exposed to temperatures around 2,000°F and pressures hundreds of thousands of times greater than at the surface — the exact conditions needed to lock carbon atoms into a diamond's crystal lattice.
The journey up
Deep volcanic eruptions carried these diamonds toward the surface in a rock called kimberlite, where they could eventually be mined. It's a rare, slow, and resource-intensive process — which is part of why mined diamonds carry a premium.
The lab shortcut
Lab grown diamonds recreate those same conditions of heat and pressure (HPHT) or build crystals from carbon gas (CVD) — producing an identical material in weeks instead of eons. Read the full process in What Is a CVD Diamond?
FAQs
How long do natural diamonds take to form?
Typically 1 to 3 billion years, deep in the Earth's mantle.
Are lab grown diamonds made the same way?
They recreate the same heat and pressure (or use carbon gas), producing the identical material far faster.
Brilliance, Made Better
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