Lab-Grown Diamonds Explained —
What They Are and What They Are Not

A lab-grown diamond is a diamond. That is the honest answer, and it belongs in the first sentence — not buried after three paragraphs of hedging. Chemically, structurally, and optically, it is the same material. The International Gemological Institute grades it on the same 4C scale. A jeweller with a loupe cannot tell the difference without specialised equipment, because there is no visual difference to find.

The question worth asking is not whether it is real. It is. The question worth asking is what a diamond actually is — and once you understand that, the rest follows naturally.

What a Diamond Actually Is

Strip away the mythology and a diamond is a specific arrangement of carbon atoms bonded together in a cubic crystal lattice. That structure — and only that structure — is what gives a diamond its hardness of 10 on the Mohs scale, its refractive index of 2.42, and its ability to split white light into its component colours. Those properties emerge from the crystal structure, not from where the growth began.

A diamond that grew underground over three billion years and a diamond that grew in a controlled chamber over six weeks are built from the same atoms, arranged in the same pattern. One took longer to form. That is the complete list of differences.

How a CVD Lab-Grown Diamond Grows

VAIMA uses CVD — Chemical Vapor Deposition — as its primary method. The process begins with a diamond seed: a thin slice of existing diamond, typically 0.3 to 0.5 millimetres thick. This seed is placed inside a sealed vacuum chamber. Carbon-rich gas — usually methane — is then introduced and energised by microwave radiation until the gas molecules break apart.

Free carbon atoms rain down onto the seed and bond, layer by microscopic layer, reproducing the cubic crystal structure that forms underground. Over several weeks, a rough diamond crystal grows. It is then cut, polished, and graded by an independent gemological laboratory — the same process applied to a mined stone.

What It Is Not

Not Moissanite

Moissanite is silicon carbide — a different material with a different chemical formula, different hardness (9.25 on the Mohs scale), and different optical properties. It is a beautiful stone in its own right, but it is not a diamond and is not positioned as one by reputable sellers.

Not Cubic Zirconia

Cubic zirconia is zirconium dioxide. It shares a cubic crystal structure with diamond but the similarity ends there. It is softer, heavier, and optically different. A cubic zirconia scratches, clouds over time, and is not certified by IGI or GIA. It is sold as a simulant — a stone that resembles a diamond — not as a diamond.

Not a Diamond Simulant

A simulant approximates the appearance of another material. A lab-grown diamond does not approximate diamond — it is diamond. The word simulant does not apply. Using it in this context is inaccurate and, in the Indian jewellery market, often deliberately misleading.

The Certification Question

IGI (International Gemological Institute) and GIA (Gemological Institute of America) both certify lab-grown diamonds. The certificate format is the same. The 4C grading — Cut, Colour, Clarity, and Carat weight — is applied using the same criteria. The only addition is a disclosure line stating the growth method, which is legally required in India and globally.

VAIMA includes the IGI certificate number on every product page. You can enter that number at igi.org and verify the grade, the stone dimensions, and the growth method directly. This is not a gesture — it is a baseline expectation of transparency that should exist across the entire industry.

Why the Price Is Lower — and What That Means

A mined diamond requires open-pit or underground extraction, explosives, heavy machinery, international supply chains, multiple trading intermediaries, and significant environmental remediation. That infrastructure is expensive. It is built into the price of every mined stone.

A lab-grown diamond requires a chamber, carbon-rich gas, energy, and time. The stone that reaches your finger is chemically identical to a mined one. The cost of producing it is not. The difference — typically 40 to 60 percent — reflects infrastructure, not quality.

It is not a discount. It is an accurate price for what the material actually costs to produce.