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Lab-grown diamonds · CVD · HPHT

Lab-growndiamonds, clearlylabelled

Chemically and optically the same diamond, grown under controlled conditions. We state the growth method on every stone and certificate, without exception.

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Laboratory-Grown · IGI
Diagram: a CVD plate grows layer by layer, an HPHT crystal grows under high pressure and temperature CVD HPHT layer by layer on a diamond seed plate pressure and heat as in the Earth’s mantle

Crystal growth

CVD and HPHT

CVD: the diamond grows layer by layer on a thin diamond seed plate in a carbon rich plasma.

HPHT: recreates the conditions of the Earth’s mantle, with pressure above 50,000 bar and temperatures above 1,300 °C.

Laboratory equipment

Controlled conditions

Consistent quality

Controlled growth gives consistent colours and sizes, ideal for serial jewellery production and matched sets. Fancy colour lab-grown diamonds are also available: pink, blue, yellow and green.

Comparison

Natural and lab-grown diamond

Physically the same material. The difference is the origin, which is why the label on the report matters.

PropertyNatural diamondLab-grown diamond
Hardness (Mohs)1010
Refractive index2.422.42
Dispersion0.0440.044
Chemical compositionPure carbon (C)Pure carbon (C)
FormationIn the Earth, 1 to 3 billion years agoCVD or HPHT, a few weeks
Label on the reportNaturalLaboratory-Grown, with growth method

FAQ

Lab-grown diamonds

Is a lab-grown diamond a real diamond?

Yes. It is a diamond with the same chemical composition, hardness and optical properties as a natural one. It is not an imitation such as glass or cubic zirconia.

What is the difference between CVD and HPHT?

A CVD crystal grows layer by layer from a carbon rich gas. HPHT recreates the high pressure and temperature inside the Earth. Both produce diamond, and the method is stated on the report.

How is it told apart from a natural diamond?

Only with specialised laboratory equipment. That is why the IGI or GIA report states laboratory origin and the girdle carries a laser inscription.

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Questions about lab-grown diamonds?

For questions about diamonds, gemstones, a partnership or custom jewellery, get in touch directly. We will be glad to help.