From a whisper of diamond to a brilliant, certified gem in just weeks — here is exactly how it happens.
The Short Answer
Lab grown diamonds are made by growing a real diamond crystal from a tiny diamond seed, using either CVD (a carbon-rich gas that deposits atoms layer by layer) or HPHT (intense heat and pressure that mimics the earth). The process takes just two to four weeks, produces pure crystalline carbon identical to a mined diamond, and the finished stone is cut, polished, and graded on the same 4Cs.
There is something quietly wonderful about knowing exactly how your diamond came to be. A lab grown diamond is not a shortcut or an imitation; it is the same brilliant carbon crystal as any diamond ever pulled from the ground, simply grown above the earth instead of beneath it, in weeks rather than eons. Understanding that process is the fastest way to feel completely confident in your choice, so let me walk you through it the way I would at our bench.
By the end you will know precisely how a lab grown diamond is made, the two methods that create them, how long it takes, and why the finished stone is a genuine diamond in every sense that matters. If you would like the wider view first, our complete guide to lab grown diamonds ties everything together.
A finished 1.0 carat round lab grown diamond — IGI certified and identical to a mined stone.
"A lab grown diamond starts as a whisper of real diamond, and grows into the whole thing."
First, What a Lab Grown Diamond Actually Is — A Real Diamond
Before the how, the crucial what: this is genuine diamond, not a look-alike.
A lab grown diamond is pure crystalline carbon arranged in the exact same lattice as a mined diamond. It has the same fire, the same brilliance, and the same perfect 10 on the Mohs hardness scale that lets a diamond shrug off a lifetime of daily wear. It is emphatically not a simulant. Cubic zirconia and moissanite are different materials that merely resemble diamond; a lab grown diamond is diamond. If that distinction is new to you, our guides on whether moissanite is a lab grown diamond and moissanite vs cubic zirconia draw the lines clearly.
Every lab grown diamond begins with a diamond seed: a thin sliver of real diamond that gives the new crystal a blueprint to grow on. From there, one of two proven methods takes over.
Method One: CVD — Growing a Diamond from Gas
The method behind most of today's beautiful, colorless lab grown diamonds.
Chemical Vapor Deposition, or CVD, is the more modern of the two techniques and produces a large share of the lab grown diamonds sold today. A diamond seed is placed inside a sealed chamber, which is then filled with a carbon-rich gas such as methane. The chamber is heated until the gas breaks down into a glowing plasma, and freed carbon atoms drift down and settle onto the seed one microscopic layer at a time. Slowly, over days, the seed grows into a larger rough diamond crystal.
CVD is prized because it tends to create very pure, consistently colorless stones and scales beautifully to larger carat sizes. It grows the crystal at lower pressure than the alternative method, in carefully controlled conditions that give cutters excellent raw material to work with. When you hear a stone described as a CVD diamond, this gentle, layered growth is what created it.
Method Two: HPHT — Recreating the Earth
The original technique, which copies nature almost exactly.
High Pressure High Temperature, or HPHT, is the older method and the one that most closely mimics how diamonds form in nature. A diamond seed is surrounded by pure carbon and placed inside a press that subjects it to staggering pressure and temperatures well above a thousand degrees Celsius. Under those conditions the carbon melts and then crystallizes onto the seed, growing a rough diamond exactly as the earth would, only vastly faster.
An HPHT diamond is every bit as real and durable as a CVD one. In practice, both methods now produce gorgeous, gem-quality stones, and once a diamond is cut and certified you cannot tell from its beauty which chamber it grew in. That is why the sensible advice is always the same: choose your stone by its final certified quality, not by the growth method printed on the report.
Cut and polished by hand, a lab grown diamond has the same brilliance as any fine diamond.
How Long It Takes — Weeks, Not Eons
One of the most charming facts about lab grown diamonds.
A natural diamond takes more than a billion years to form deep underground and a great deal of geological luck to reach the surface. A lab grown diamond reaches its rough form in roughly two to four weeks, depending on the size and method. Larger stones take longer, since growing a three-carat crystal is meaningfully harder and slower than growing three one-carat crystals.
Once the rough crystal is ready, the timeline mirrors any fine diamond: a master cutter studies the rough, plans the facets to maximize brilliance, and then cuts and polishes the stone by hand and machine. This cutting stage is pure craftsmanship and is identical to the work done on mined diamonds. The result is a finished gem ready to be graded.
Grading & Certification — The Same 4Cs
This is where a lab grown diamond proves itself on paper.
After cutting, a lab grown diamond is sent to an independent laboratory and graded on the very same 4Cs as a mined diamond: cut, color, clarity, and carat. The report also confirms the stone is laboratory grown and usually notes the growth method. Most lab grown diamonds are graded by IGI, which developed dedicated lab grown grading protocols early and certifies the majority of the world's lab grown stones.
Certification is what lets you compare a lab grown and a natural diamond on identical, honest terms, and it protects you from misrepresented quality. Every Aquamarise lab grown diamond arrives independently IGI certified, and you can read about our approach to disclosure on our diamond transparency and traceability page. To understand which laboratory to trust and why, see our full breakdown of IGI vs GIA certification.
Why the Process Matters to You — Confidence and Value
The how connects directly to the two things buyers care about most.
Knowing how lab grown diamonds are made settles the two questions that bring most people to this page. First, is it a real diamond? Yes, unquestionably, grown from real diamond and identical in every physical way. Second, why does it cost so much less? Because it is created to meet demand in weeks rather than mined from a scarce, century-old supply chain, that efficiency is passed straight to you, often as a saving of 70 to 90 percent over a comparable mined diamond.
That combination, genuine diamond plus a friendlier price, is exactly why more than half of couples now choose a lab grown center stone. If you want to see how the two origins stack up head to head, our lab grown vs natural diamond comparison lays it out, and our honest take on whether lab grown diamonds are worth it helps you decide. Curious what it all costs? Our lab grown diamond price guide shows what a carat actually runs in 2026, and if resale is on your mind, do lab grown diamonds hold value answers it honestly.
When you are ready to see the finished result, our lab grown diamond collection and engagement rings for women are full of designs that pair a certified lab grown stone with a solid gold setting that holds real, lasting value.
Every Aquamarise lab grown diamond arrives independently IGI certified on the full 4Cs.
From Rough to Finished Ring — The Last Mile
Growing the stone is only half the journey to your finger.
Once a lab grown diamond is cut, polished, and certified, it still has to become a ring, and that final mile is where craftsmanship really shows. A skilled setter chooses the metal, shapes the prongs or bezel, and secures the stone so it sits level, catches light, and holds fast for decades of wear. At Aquamarise, that means setting your certified stone in solid 14K to 18K gold or platinum, never plating, so the piece has genuine, lasting substance from the diamond down to the band.
Because our solid gold pieces are made to order, they are crafted specifically for you rather than pulled from a shelf, which is also why solid gold designs carry a short production window. It is a small wait for a ring built properly, with metal that holds intrinsic value and a stone documented on its own certificate. If you would like to shape the whole thing from scratch, our custom ring service and guide to building a custom engagement ring make it simple, and our solid gold engagement rings show what a grown diamond looks like in metal worth keeping. To keep it brilliant for years, our jewelry care tips help.
Common Myths — Cleared Up at the Bench
A few persistent misunderstandings, put to rest honestly.
Because lab grown diamonds are still new to many shoppers, a handful of myths circulate that deserve a plain correction. "They're fake." Not so; a lab grown diamond is pure crystalline carbon, chemically and optically identical to a mined stone. Fake would be cubic zirconia, a different material entirely. "They look cloudy or off." Quality varies as it does with any diamond, but a well-graded lab grown stone is bright, clear, and indistinguishable from a natural one by eye.
"They won't last." They score a perfect 10 on the Mohs hardness scale, exactly like mined diamonds, so they endure a lifetime of daily wear and can be passed down. "They can't be certified." On the contrary, most are IGI certified on the full 4Cs, with the origin and often the growth method documented. "Low resale means they're worthless." Resale is modest, yes, but almost no ring is bought to be sold, and the beauty, durability, and everyday value are entirely real. If any of these worried you, let them go; the science is firmly on your side. Our are lab grown diamonds worth it guide weighs the honest pros and cons in full.
Your Questions, Answered — How Lab Grown Diamonds Are Made
The details buyers ask us about most.
See how beautiful a grown diamond can be — set in solid gold
Every Aquamarise lab grown diamond is IGI-certified and set in solid gold or platinum, never plated. Handcrafted to order and backed by our lifetime warranty, it is real diamond made to be worn and kept for a lifetime.
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