Diamond chemistry
Are lab-grown diamonds real?
Yes. Not real-ish, not almost. A lab-grown diamond is carbon crystallised into exactly the same structure as a mined diamond, with the same hardness, the same fire, and the same certificate.
The one-sentence answer
A diamond is defined by what it is (crystallised carbon in a cubic lattice), not by where it formed, and a lab-grown diamond is exactly that material, so it is a real diamond. Everything below is detail.
Same stone, different birthplace
A mined diamond formed under heat and pressure deep in the earth. A lab-grown diamond forms under the same kind of conditions, recreated in a growth chamber, either by high-pressure high-temperature (HPHT) growing or by chemical vapour deposition (CVD), where carbon builds up on a diamond seed layer by layer. Both routes end at the same destination: pure crystallised carbon.
That is the crucial difference between lab-grown diamonds and lookalikes. Cubic zirconia and moissanite are different materials that imitate a diamond. A lab-grown diamond is not an imitation of anything. It is the same material, full stop.
Same chemistry
Pure carbon in the same cubic crystal structure. There is no chemical test that separates the two, because chemically there is nothing to separate.
Same hardness
A 10 on the Mohs scale, the hardest natural material. It wears the same, lasts the same, and survives daily life the same.
Same sparkle
Identical refractive index and dispersion, which is the physics behind brilliance and fire. The light show is the same because the material is the same.
Same grading
Graded by the same independent laboratories on the same 4Cs: carat, colour, clarity, and cut. Every Stacked&Co diamond comes with an IGI certificate.
Can a jeweller tell the difference?
Not by looking, and not with a loupe. Because the material is identical, telling a lab-grown diamond from a mined one takes specialised laboratory equipment that reads subtle growth patterns, and grading labs inscribe the report number on the girdle of the stone so its origin is always traceable. That is worth sitting with for a second: the only way to know is a machine built specifically to find out.
The South African question
We get it. This is diamond country. South Africa's mining heritage runs deep, and plenty of local jewellers are openly sceptical of lab-grown stones. So let us be precise about what the scepticism can and cannot claim: it cannot claim the stones are not diamonds, because the chemistry, the grading labs, and the certificates all say otherwise. What it can claim is that a mined stone carries geological rarity, and that is true. A billion-year backstory is a real thing to value.
Our position is simply that you should pay for the diamond you can see and wear, not for the supply chain behind it. A lab-grown diamond gives you the identical material at a fraction of the price, which usually means a bigger or better stone for the same budget. The rand maths is laid out in lab-grown vs mined prices.
How to buy with confidence
- Insist on an independent certificate. Every Stacked&Co diamond is IGI certified, and you can verify the report yourself. Our IGI certificate guide shows you how.
- Compare like for like: same carat, same cut grade, same metal.
- Ask what happens after the sale. We include one free resize on engagement rings and free insured delivery across South Africa.
Not sure where to start?
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