CVD laboratory-grown diamonds
CVD lab-grown diamond manufacturer in India
We grow CVD diamonds in our own reactors and cut them in our own workshop, so you buy from the grower, not a chain of traders.
How a CVD diamond grows
CVD (chemical vapour deposition) builds diamond one atomic layer at a time. Thin diamond seed plates sit inside a sealed reactor. A mix of hydrogen and a little methane flows in, and microwave energy turns it into a glowing plasma — the orange light our name comes from. Carbon atoms break free from the gas and settle on the seed, extending its crystal lattice.
Over several weeks the seed becomes a flat, tabular rough crystal. Our cutters then plan, saw, shape and polish it.
- Seed. Polished diamond plates are cleaned and loaded into the reactor.
- Grow. Microwave plasma deposits diamond on the seeds under tightly controlled temperature and gas flow.
- Inspect. Rough is checked for colour, strain and inclusions before planning.
- Cut and polish. Rough is planned for yield and make, then cut and polished in-house.
- Grade and ship. Stones are sorted, graded where ordered, and shipped.
As-grown and treated: always disclosed
Many CVD diamonds receive a post-growth treatment to improve colour. It is normal in the industry and does not make the diamond less real, but buyers and their customers have a right to know. We state which stones are as-grown and which are treated, and independent reports record it.
What to specify
| What to specify | Typical options |
|---|---|
| Shape | Round brilliant, oval, emerald, cushion, pear, radiant, princess, marquise, asscher, heart |
| Size | Single stones by carat, or calibrated parcels by millimetre |
| Colour | D–F, G–H, I–J for white; fancy colours by hue and intensity |
| Clarity | IF, VVS1–VVS2, VS1–VS2, SI1–SI2 |
| Cut, polish, symmetry | Excellent / Very Good for rounds; proportions to your brief for fancy shapes |
| Report | IGI, GIA or another laboratory, or ungraded parcels |
| Growth and treatment | As-grown or post-growth treated, always disclosed |
CVD or HPHT?
| CVD | HPHT | |
|---|---|---|
| How it grows | Carbon from a methane–hydrogen plasma settles on flat diamond seed plates, layer by layer | Carbon dissolves in molten metal under about 50,000–60,000 bar and grows on a seed crystal |
| Crystal habit | Tabular (flat) rough | Cubo-octahedral rough |
| Diamond type | Usually Type IIa (no measurable nitrogen) | Type IIa for colourless; Type Ib (yellow) or IIb (blue) when nitrogen or boron is present |
| Often used for | Larger white stones, pinks | Strong colourless whites, blues, yellows, melee |
| Post-growth treatment | Common, to improve colour; must be disclosed | Less common for colourless; used for some fancy colours |
| Report states method | Yes | Yes |
Not sure which suits your order? Tell us what you need and we will recommend one. See also HPHT diamonds and large carats.
Send us your requirement
Use the requirement form or email sales@intidiamonds.com with:
- Shape: round, oval, emerald, cushion, pear, radiant, princess, marquise, asscher, heart or others
- Carat range per stone, or total carats for a parcel
- Colour and clarity range
- Quantity, and whether you need matched pairs or calibrated sizes
- Grading reports, if you need them, and which laboratory
- Delivery country and the date you need the goods
We reply with what we have in stock and what we can grow for you.
Questions buyers ask
What is the difference between CVD and HPHT diamonds?
Both make real diamond. CVD grows diamond from a carbon-rich plasma onto flat seed plates; HPHT grows it in molten metal under very high pressure and temperature. Polished stones from either method are graded on the same scales, and the grading report states which method was used.
Do you disclose post-growth treatment?
Yes. Some CVD diamonds are treated after growth to improve colour. We tell you which stones are as-grown and which are treated, and independent grading reports note it.
Which grading laboratories do you work with?
We can supply stones with reports from IGI, GIA or another laboratory you prefer, or as ungraded parcels for melee and calibrated goods. Tell us your requirement when you enquire.
Can you make matched pairs and calibrated parcels?
Yes. Tell us the shape, size tolerance and quantity, and we will quote from stock or plan a production run.