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Lab-Grown Diamonds — The Complete Guide

Lab-grown diamonds are real diamonds. Certified by IGI, chemically identical to natural, and typically 60–80% less expensive. Everything you need to know before buying.

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THE SHORT ANSWER

A lab-grown diamond is a real diamond. The laboratory is simply where it was born.

Lab-grown diamonds are real diamonds. Not simulants. Not imitations. They are grown in a laboratory using processes that replicate the conditions found deep within the earth, producing a stone that is chemically, physically, and optically identical to a mined diamond.

The only difference is origin. A gemologist cannot tell them apart without specialist equipment. GIA and IGI — the world's most respected diamond grading laboratories — certify both.

This guide covers everything you need to know: how they are made, how they compare to natural diamonds, what grades to look for, and what a lab-grown diamond means for your budget when commissioning a bespoke ring.

  • IGI certified lab-grown diamonds
  • Chemically identical to natural
  • Free consultation included
  • Free design included
  • No hidden mark-ups
  • UK hallmarked jewellery
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THE SCIENCE, PLAINLY STATED

Two ways to grow a real diamond

Lab-grown diamonds are made using one of two processes. Both replicate conditions found in nature. Both produce a diamond that is chemically, physically, and optically identical to a mined stone.

METHOD 1

HPHT — High Pressure High Temperature

HPHT replicates the conditions found deep within the earth, where natural diamonds form. A small diamond seed is placed in carbon and exposed to extreme pressure — around 1.5 million pounds per square inch — and temperatures exceeding 1,400°C.

Under these conditions, the carbon melts and crystallises around the seed, forming a new diamond. The process takes several weeks. The result is a diamond with the same crystal structure as one formed over millions of years underground.

Developed Originally developed in the 1950s. Now the most established method for gem-quality lab-grown diamonds.

METHOD 2

CVD — Chemical Vapour Deposition

CVD grows a diamond in a controlled chamber filled with carbon-rich gas, typically methane,. The chamber is heated until the gas breaks down, releasing carbon atoms that settle layer by layer onto a diamond seed, forming a new crystal.

CVD operates at lower pressures than HPHT and allows precise control over the growing environment. It is now the dominant method for producing gem-quality lab-grown diamonds and is capable of producing very large, high-clarity stones.

Advantage Produces larger, higher-clarity stones with greater consistency. The method behind most modern gem-quality lab-grown diamonds.

Both HPHT and CVD produce diamonds that meet the same IGI and GIA grading standards as natural diamonds. The method of growth does not affect the stone's grade, appearance, or durability, and is not noted on the certificate.

NOT ALL SPARKLE IS THE SAME

Lab-grown diamonds are not simulants

A diamond simulant is a stone that looks like a diamond but is not one: chemically, physically, or structurally. Moissanite is silicon carbide. Cubic zirconia is zirconium dioxide. Both are sometimes marketed as diamond alternatives, and both are entirely different materials from diamond.

A lab-grown diamond is not a simulant. It is a diamond — carbon atoms arranged in the same crystal structure as every diamond ever pulled from the ground. It is graded by the same laboratories, to the same standards, using the same 4Cs.

The confusion is understandable. The distinction matters. If you want a diamond, only a diamond — natural or lab-grown — is a diamond.

  • Lab-grown diamond

    Carbon atoms in a diamond crystal structure. Chemically, physically, and optically identical to natural diamond. IGI or GIA certified. A real diamond in every measurable sense.

  • Moissanite

    Silicon carbide, a different material entirely. Higher refractive index than diamond, which gives a distinctive rainbow sparkle effect. Not a diamond. Not diamond-certified.

  • Cubic zirconia

    Zirconium dioxide, a synthetic material. Significantly softer and less durable than diamond (8.5 vs 10 on the Mohs scale). Not a diamond. No grading certificate.

The clear distinction

Moissanite and cubic zirconia are not diamonds. A lab-grown diamond is. That is not a matter of opinion; it is chemistry.

AN HONEST COMPARISON

Natural vs lab-grown — the real differences

We are genuinely neutral on this. Both are real diamonds. Both are certified by GIA or IGI. The differences are practical and worth understanding before you choose.

Attribute
Natural diamond
Lab-grown diamond
Appearance Identical to lab-grown. A jeweller cannot tell them apart without specialist equipment. Identical to natural. Chemically, physically, and optically the same.
Certification GIA or IGI certificate. Records cut, colour, clarity, and carat weight. IGI certificate. Same 4Cs grading as natural. Certificate confirms laboratory origin.
Price Higher for an equivalent grade. Rarity and mining costs are reflected in the price. Typically 60–80% less than an equivalent natural stone. The gap has widened as production has scaled.
Resale value Holds value more reliably than lab-grown. More relevant if you plan to sell or upgrade. Currently low and falling as production increases. Relevant only if you plan to resell. Most engagement ring buyers do not.
Ethics Complex supply chains. All natural diamonds we source are conflict-free under the Kimberley Process. Fairtrade gold available on request. No mining footprint. No Kimberley Process required. For buyers where ethical sourcing is a priority, lab-grown is the clearest choice.
Best for Clients who value provenance, rarity, and long-term value retention. Those who may wish to upgrade or sell in the future. Clients who want the best possible stone for their budget. Those for whom resale is not a consideration.

Our view: if resale is not a priority, lab-grown gives you a significantly better stone for the same budget. We present both options at every consultation and will tell you honestly which gives better value for your specific brief.

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WHAT TO LOOK FOR WHEN BUYING

The 4Cs — and what actually matters

Cut, Colour, Clarity, and Carat are the global standard for grading diamonds. Every GIA and IGI certificate records all four. Not all four matter equally — here is what to prioritise.

Most important

THE FIRST C

Cut

Cut determines how well a diamond interacts with light. Brilliance, fire, and scintillation are determined entirely by cut: it is the single most important factor in how beautiful a diamond looks.

A smaller, Excellent-cut stone will always outperform a larger, poorly cut stone. Never compromise on cut to gain carat weight.

Our recommendation Excellent or Ideal for round brilliant. Very Good as a minimum for all other shapes.
Read the full cut guide
Second priority

THE SECOND C

Colour

Colour measures how colourless a diamond is, graded D (perfectly colourless) to Z (noticeable yellow tint). The difference between grades D and G is invisible to the naked eye in most settings.

The metal you choose affects perceived colour — yellow gold flatters warmer grades, while white metal and platinum show a diamond's true grade more clearly.

Our recommendation G–H for white metal settings. H–I for yellow or rose gold. D–F is a premium with no visible benefit in most rings.
Read the full colour guide
Third priority

THE THIRD C

Clarity

Clarity grades internal inclusions and external blemishes, from FL (Flawless) to I (Included). Most inclusions are invisible to the naked eye, visible only under 10x magnification.

For step-cut shapes like emerald and asscher, choose higher clarity — the faceting style makes inclusions more visible than in brilliant cuts.

Our recommendation VS2 or SI1 for brilliant cuts: eye-clean and excellent value. VS1 or above for emerald and asscher cuts.
Read the full clarity guide
Consider last

THE FOURTH C

Carat

Carat measures a diamond's weight, not its size. Visual size depends on cut quality and shape. A well-cut 0.9ct stone will look larger than a poorly cut 1.0ct stone.

Choosing a stone just below a round number (0.90ct instead of 1.0ct, 1.45ct instead of 1.5ct) often gives significant savings with no visible difference.

Our recommendation Prioritise cut quality over carat weight. Consider just-below weights for better value without visible compromise.
Read the full carat guide

At your free consultation, we walk through all four Cs with your specific brief in mind, and show you exactly where to spend and where to save for the best result at your budget.

THE VALUE CASE, MADE PLAIN

What lab-grown means for your budget

Lab-grown diamonds are typically 60–80% less than an equivalent natural stone. Here is what that means in practice at three common budget levels.

Entry budget

£1,500

total ring budget

Natural diamond Around 0.40–0.50ct round, G–H colour, VS2 clarity, 18ct yellow gold solitaire. Stone alone: £370–£460.
Lab-grown diamond Around 1.00ct round, F–G colour, VS2 clarity, 18ct yellow gold solitaire. Stone alone: £240–£280.

A full carat lab stone costs less than a half-carat natural

Mid budget

£2,500

total ring budget

Natural diamond Around 1.00ct round, G–H colour, VS2 clarity, 18ct white gold solitaire. Stone alone: £1,180–£1,280.
Lab-grown diamond Around 2.00ct round, F–G colour, VS1 clarity, 18ct white gold solitaire. Stone alone: £370–£430.

A 2ct lab stone costs less than a 1ct natural, with £1,500+ remaining for metalwork

Premium budget

£4,000

total ring budget

Natural diamond Around 1.20ct round, G–H colour, VS2 clarity, 18ct white gold solitaire. Stone alone: £2,590–£2,850, leaving little for the setting.
Lab-grown diamond Around 2.00ct round, E–F colour, VS1 clarity, platinum setting with pavé band. Stone alone: £370–£430, leaving substantial budget for metalwork.

2ct stone in platinum with a pavé band, for the same spend that buys a 1.2ct natural in white gold

These are indicative examples based on current stone pricing. Exact specifications vary. At your free consultation we will show you real stones at your budget and give you an honest comparison.

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Independent verification

Every stone independently certified

We only supply diamonds with a full grading certificate. You receive it with your ring.

IGI — International Gemological Institute

IGI Certified Diamonds

Every lab-grown diamond we source carries a full IGI certificate grading cut, colour, clarity, and carat weight. The certificate also explicitly confirms laboratory origin, so you know exactly what you are buying and can verify it independently.

Independent grading
GIA — Gemological Institute of America

What the certificate tells you

Your IGI certificate is a document produced by an independent laboratory with no commercial interest in the sale. It records the stone's four grades and confirms it is a laboratory-grown diamond. We include it with every commission as standard.

Included as standard

Every stone verified. Every source accountable.

Diamond shapes

Explore the ten most popular diamond shapes

Each shape carries a distinct character, proportion, and light behaviour. Select one to explore its profile, settings, and what makes it right for your commission.

Round — top view
Round — side profile

Round

Brilliant cut

Oval — top view
Oval — side profile

Oval

Elongated sparkle

Cushion — top view
Cushion — side profile

Cushion

Soft brilliance

Princess — top view
Princess — side profile

Princess

Step & brilliant

Emerald — top view
Emerald — side profile

Emerald

Step cut

Pear — top view
Pear — side profile

Pear

Teardrop

Marquise — top view
Marquise — side profile

Marquise

Navette

Radiant — top view
Radiant — side profile

Radiant

Crushed ice

Asscher — top view
Asscher — side profile

Asscher

Square step

Heart — top view
Heart — side profile

Heart

Romantic

Not sure which shape suits you? We can guide you through the options during your consultation.

Made for your ring

Your diamond, your design

Choosing a lab-grown diamond is only the first decision. The shape, the setting, the metal, and the way the stone is held all determine how it will look on the hand, and how it will feel to wear for a lifetime.

At À Vie we work with you to match the right stone to the right design. Every commission begins with a conversation, not a catalogue. We source the diamond to suit your brief, not the other way around.

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The consultation

We begin with a conversation about your vision, budget, and how the ring will be worn. No obligation, no pressure.

Stone selection

We source lab-grown diamonds that match your brief exactly: the right cut, grade, and carat for your design and budget.

The design

Your setting is drawn and refined with you before anything is made. We work until the design is right.

Handcrafted by skilled goldsmiths

Every ring is made by hand by skilled goldsmiths. Your IGI certificate is included as standard.

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Every ring begins with a single conversation.

Common questions answered honestly

Lab-grown diamond FAQs

Yes. Lab-grown diamonds are real diamonds. Not simulants, not imitations. They are chemically, physically, and optically identical to natural mined diamonds. The only difference is that they were grown in a laboratory rather than extracted from the earth. GIA and IGI, the world's most respected grading laboratories, certify both natural and lab-grown diamonds to the same standards.

Not with the naked eye, and not with standard jeweller's tools. A trained gemologist using specialist equipment can identify a lab-grown diamond, but this requires laboratory-grade testing. To anyone looking at the ring, including other jewellers, a lab-grown and natural diamond of the same grade are visually identical.

Typically 60–80% less than an equivalent natural stone of the same grade. The price gap has widened over the past few years as lab-grown production has scaled. This means a client with a £2,000 budget can access a significantly larger, higher-quality stone than they could with a natural diamond at the same spend.

Honestly, no. Not currently. Lab-grown diamond resale values are low and have been falling as production increases. If you plan to sell the ring in the future, a natural diamond holds value more reliably. If you have no plans to sell — which is the case for most engagement ring buyers — this distinction is largely irrelevant, and the significant saving on purchase price speaks for itself.

Every lab-grown diamond we source comes with a full certificate from the International Gemological Institute (IGI). The certificate records cut, colour, clarity, and carat weight: the same 4Cs used for natural diamonds — and confirms the stone was laboratory grown. GIA also certifies lab-grown diamonds. We only supply certified stones.

Lab-grown diamonds have no mining footprint, which removes the supply chain concerns associated with natural diamond extraction. There is no land disruption, no risk of conflict sourcing, and no Kimberley Process compliance required. For buyers for whom ethical sourcing is a priority, lab-grown is the clearest choice. That said, all natural diamonds we supply are also conflict-free under the Kimberley Process.

Yes. Lab-grown diamonds are available in every shape: round brilliant, oval, cushion, emerald cut, pear, princess, marquise, asscher, radiant, and heart. Shape does not affect whether a diamond is natural or lab-grown. Our full diamond shapes guide covers every option in detail.

Yes, and this is where the value case becomes most compelling. A lab-grown diamond in a bespoke setting, designed around your brief and certified by IGI, is indistinguishable from anything a high street brand would sell at double the price. The stone is real, the ring is made for you, and the saving is significant. We guide you through both options at your free consultation so you can choose with full information.

Moissanite is not a diamond; it is a different stone entirely (silicon carbide). It is sometimes marketed as a diamond alternative but it has different optical and physical properties. A lab-grown diamond is a real diamond in every measurable sense. The confusion is common but the distinction is important: if you want a diamond, only a diamond — natural or lab-grown — is a diamond.

Still have a question? Our team typically responds within one business day.

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Bespoke lab-grown diamond rings

A real diamond. Designed around you.

Free consultation. Free design. Nothing made until you approve it. A lab-grown diamond in a bespoke setting costs a fraction of what you would pay on the high street, and is indistinguishable from any ring in a branded display case.
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IGI Certified Chemically identical to natural diamonds Crafted to order by specialist goldsmiths