Lab-Grown Diamonds with IGI Certificate

All our lab-grown diamonds come with an IGI certificate and an IDEAL / EXCELLENT cut grade. Select the cut, size and clarity – you can buy the stone loose or choose it as the centre diamond in our jewellery configurator. Prices are per stone and include VAT.

Small lab-grown diamonds E-F / VVS-VS in stock – for use as side stones or in custom-made pieces. The price is per stone, incl. VAT.

Shape

Size

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– ct

Colour / clarity

Availability

Carats	Dimensions	Shape	Colour / clarity	Cut grade	Certificate	Availability	Price

Could not find exactly the stone you are looking for? We will find a lab-grown diamond to your specification – by cut, size, quality and budget. We also source stones beyond our listed range; just fill in the form below.

All about lab-grown diamonds – quality, certification, growth methods →

Top-quality lab-grown diamonds with a best price guarantee

We offer lab-grown diamonds in the highest grades only – D–E colour, VVS1–VVS2 clarity and an IDEAL / EXCELLENT cut. These are stones of maximum brilliance with no flaw visible to the naked eye, and each one comes with an international IGI certificate that independently confirms its specifications. We buy our stones directly from the producers with no middlemen, which is why we guarantee the best price on the market.

Which colour and clarity should you choose? For lab-grown diamonds we recommend D–E colour combined with VVS1–VVS2 clarity – the ideal choice for maximum beauty and value.

Diamond colour

For lab-grown diamonds we recommend colour D–E

Colourless

Near colourless

Faint tint

K–M

Faint yellow

N–R

Visibly yellow

S–Z

Distinctly yellow

Colourless

Near colourless

Tinted

Diamond clarity

For lab-grown diamonds we recommend clarity VVS1–VVS2

Flawless

Internally flawless

VVS1

Very very slight inclusions

VVS2

Very very slight inclusions

VS1

Very slight inclusions

VS2

Very slight inclusions

SI1

Slight inclusions

SI2

Easily visible inclusions

Obvious inclusions

Prominent inclusions

Very prominent inclusions

Flawless

Very slight inclusions

Visible inclusions

Pro lab-diamanty doporučujeme kombinaci D–E barvy a VVS1–VVS2 čistoty – ideální volba pro maximální krásu a hodnotu.

Outstanding brilliance
Best quality / price ratio
An investment that makes sense

IGI certificate for a lab-grown diamond – sample

Sample IGI certificate

This is what the IGI (International Gemological Institute) certificate you receive with every lab-grown diamond looks like. It states the carat weight, colour, clarity, the cut, polish and symmetry grades, the exact measurements and the laser inscription on the girdle, by which the stone can be verified at any time.

Open the sample IGI certificate (PDF) →
How to verify an IGI certificate online →

How to choose a lab-grown diamond and what it costs

A lab-grown diamond is a real diamond: the same chemical composition, hardness 10 on the Mohs scale and the same brilliance as a mined stone. It grows in a few weeks using the HPHT or CVD method and no one can tell it apart from a mined diamond by eye – only a specialised laboratory can. That is why every stone in the table above comes with its own IGI certificate.

The price of a lab-grown diamond

Price is set by the 4Cs: carat weight, cut, colour and clarity. All prices include VAT and are per stone. Price does not rise evenly with weight – it jumps at 1.00 ct and 2.00 ct. Choosing 0.90 ct instead of 1.00 ct is invisible on the hand but noticeably cheaper. Use the filter above the table to compare stones in stock and made to order.

Quality: colour, clarity and cut

For our jewellery we select stones in colour D–F (colourless) and clarity VVS to VS, which are clean to the eye. The cut matters most: only a stone graded Excellent (Ideal for round brilliants) returns light the way you expect from a diamond, so we check proportions and symmetry on every stone.

An IGI certificate with every stone

The IGI report lists measurements, weight, colour, clarity, cut grade and the growth method. The certificate number is usually laser-inscribed on the girdle and can be verified in the IGI database.

Delivery and setting

Stones marked “in stock” ship within 1–2 business days; for made-to-order stones we confirm the date by e-mail. You can buy the diamond on its own, or have it set straight away: in our bespoke service the ring is built around your stone, handmade in 2–4 weeks. Finished designs are in Sirius jewellery.

Frequently asked questions

How much does a lab-grown diamond cost?

It depends on weight, cut, colour and clarity. Current prices of stones in stock and made to order are in the table on this page – final, including VAT, per stone. A lab-grown diamond costs far less than a mined diamond of the same specification.

Can I tell a lab-grown diamond from a mined one?

Not by eye or with a common tester – it is physically and chemically identical. Only a specialised laboratory can identify growth features.

What is the difference between HPHT and CVD?

HPHT recreates the high pressure and temperature of the Earth’s mantle; CVD grows the diamond from a hydrocarbon gas in a vacuum chamber. Both produce a real diamond and the IGI certificate states the method.

Can you set the diamond into my own ring?

Yes – tell us about the piece and we will agree on the process. More often we make a new ring around the chosen stone, handmade in the Czech Republic in about 2–4 weeks.

Do prices include VAT?

Yes, all prices are final including VAT. Luxury packaging is free and we ship insured across the EU.

Buy a Lab-Grown Diamond

Top-quality lab-grown diamonds with a best price guarantee

Diamond colour

Diamond clarity

Sample IGI certificate

How to choose a lab-grown diamond and what it costs

The price of a lab-grown diamond

Quality: colour, clarity and cut

An IGI certificate with every stone

Delivery and setting

Frequently asked questions