Lab grown diamonds can seem almost too good to be true: a real diamond, identical to a mined one, at a fraction of the price. Understanding how they are actually made clears up the mystery — and explains exactly why they are so special. The science is remarkable, and it is the reason these stones deserve to be taken seriously as the equal of anything pulled from the ground.
Lab grown diamonds are created in weeks using one of two proven methods, HPHT or CVD, both of which recreate the conditions that form natural diamonds. The result is pure crystallized carbon — chemically and optically identical to a mined diamond, graded by GIA and IGI, and typically 60–80% more affordable.
It Starts With a Diamond Seed
Both growing methods begin with a tiny slice of diamond called a seed. From that seed, a full crystal is built up atom by atom. Because the starting material and the end result are the same carbon lattice as a natural diamond, the stone that emerges is not an imitation or a simulant like cubic zirconia — it is the genuine article. You can see the finished stones on our lab grown diamonds page.
Method One: High Pressure High Temperature (HPHT)
HPHT recreates the extreme environment deep within the earth where natural diamonds form. The seed is placed with a source of carbon and exposed to temperatures above 1,400°C and pressures of many gigapascals. Under those conditions the carbon dissolves and crystallizes onto the seed, growing a rough diamond that is then cut and polished. It is the older of the two techniques and produces exceptionally high-quality stones.
Method Two: Chemical Vapor Deposition (CVD)
CVD takes a different route. The seed is placed in a sealed chamber filled with a carbon-rich gas such as methane. The gas is heated until it breaks down, and carbon atoms rain down onto the seed, building the diamond layer by layer. CVD offers precise control over the growing conditions and has become the method of choice for many high-clarity stones.
Why the Process Makes Them Special
Because growing a diamond is fast, traceable, and free of large-scale mining, these stones combine a clear ethical origin with real affordability. That is why they are increasingly chosen for engagement rings, wedding bands, and eternity rings. And since they are the same material as mined diamonds, you never trade beauty for value — our price comparison shows just how much you save. To understand how the finished stone is graded, see our diamond education guide.
Frequently Asked Questions
How are lab grown diamonds made?
Using HPHT, which recreates the earth’s heat and pressure, or CVD, which grows the diamond layer by layer from a carbon-rich gas.
Are they the same as mined diamonds?
Yes — pure crystallized carbon with identical properties, graded by GIA and IGI just like mined diamonds.
How long does it take to grow one?
Roughly two to eight weeks depending on size and method, versus the billions of years a natural diamond takes.
