Lab Grown Diamond Vs Natural Diamond

Same carbon. Same crystal. Same fire, brilliance and forever.
Two very different journeys to your ring. One is simply the smarter choice.

Lab Grown

2–8 Weeks

Natural

1–3 Billion Years

100%
Real
Mohs
10
Save
60–85%
IGI
GIA

Identical diamond. Different Origin. Very Different Price.

A lab-grown diamond is chemically, physically and optically identical to a natural mined diamond. It is the same pure crystallised carbon, with the same Mohs 10 hardness, brilliance and fire. The only difference is where the crystal formed. One forms deep inside the Earth over billions of years, while the other grows inside a precision growth chamber in just a few weeks.

Because lab-grown diamonds skip the entire mining process, a like-for-like stone typically costs 60–85% less, comes with a guaranteed conflict-free origin, and lets you choose a larger, higher-grade diamond within the same budget. That is why Ratnam Labs recommends lab-grown diamonds for most buyers. This guide explains everything you need to know before making your choice.

What is a Lab-Grown?

A lab-grown diamond, also called a lab-created, man-made, engineered or cultured diamond, is a real diamond grown above ground in a controlled environment that reproduces the exact conditions under which diamonds crystallise in nature.

It starts with a thin slice of diamond called a seed. Carbon atoms then bond to that seed, layer by layer, forming the same rigid cubic lattice that gives every diamond its legendary hardness and light performance. The result is not an imitation, a look-alike or a "synthetic stone" in the everyday sense. It is crystallised carbon, atom for atom the same material as a diamond pulled from a mine.

This is not just marketing language. In 2018, the U.S. Federal Trade Commission (FTC) revised its Jewellery Guides and removed the word "natural" from its definition of a diamond. The change formally recognised that a diamond is a diamond, regardless of whether it formed in the Earth or in a laboratory. Leading gemological institutes, including IGI and GIA, grade lab-grown diamonds using the same 4Cs standards applied to mined diamonds.

Grown, Not Manufactured

A lab-grown diamond genuinely grows, crystal by crystal layer, exactly as it would in nature, only faster, cleaner and under carefully controlled conditions.

Not a Simulant

Cubic zirconia and moissanite may look like diamonds. A lab-grown diamond is a real diamond that registers as one on a jeweller's diamond tester.

Size Issue

It will never fade, cloud, yellow or lose its sparkle. A diamond remains the hardest known natural material, regardless of where it was formed.

How Lab-Grown Diamonds Are Made: HPHT & CVD

Two proven technologies produce gem-quality diamonds today. Both begin with a diamond seed and end with a rough crystal that is cut and polished by the same master cutters who work on mined diamonds.

Method 01

HPHT – High Pressure, High Temperature

HPHT recreates the crushing conditions of the Earth's mantle inside a press the size of a small room.

  1. A diamond seed is placed in a growth cell with pure carbon and a metal catalyst.
  2. The cell is heated to roughly 1,300–1,600°C and squeezed under extreme pressure.
  3. The carbon dissolves, migrates to the cooler seed and crystallises into a diamond.
  4. Over days to weeks, a rough diamond forms, ready for cutting and polishing.
Temperature 1,300–1,600°C
Pressure ≈ 5–6 GPa
Typical growth time Days – weeks
Known for Excellent colour, robust crystals
Method 02

CVD – Chemical Vapour Deposition

CVD grows diamond the way frost forms on glass — atom by atom, from a carbon-rich gas.

  1. Diamond seed plates are placed in a sealed vacuum chamber.
  2. The chamber is filled with hydrogen and methane gas and energised into a glowing plasma.
  3. The plasma breaks the gas apart; free carbon atoms rain down and bond to the seed.
  4. Over several weeks the crystal thickens into gem-quality rough.
Temperature 700–1,200°C
Process Methane + hydrogen plasma
Typical growth time 2–8 weeks
Known for Type IIa purity, large sizes

Neither method is better by default. A diamond's final beauty depends on the individual crystal and, above all, the quality of its cut. Both HPHT and CVD diamonds are graded using the same 4Cs standards.

What Is A Natural Diamond?

Natural diamonds crystallised between one and three and a half billion years ago, around 150 to 250 kilometres below the Earth's surface. In the mantle, extreme heat and pressure transformed carbon into diamond.

Ancient volcanic eruptions later carried these crystals upward through kimberlite and lamproite pipes. These natural pathways brought the diamonds close enough to the surface to be discovered. To recover them, miners move enormous volumes of rock through open-pit, underground, alluvial (riverbed) and marine mining. Industry estimates suggest that up to 250 tonnes of earth may be processed to produce a single polished carat. Only a small fraction of mined diamonds are gem quality, while the rest are used for industrial applications.

None of this changes what the stone is. A natural diamond and a lab-grown diamond are the same mineral. The only difference is the journey. One forms over billions of years beneath the Earth through geological processes. The other grows in just a few weeks under carefully controlled conditions, with a fully documented origin.

Are lab-grown diamonds real diamonds? Yes, measurably.

"Real" is defined by science, not perception. Lab-grown and natural diamonds share the same physical properties.

Carbon (C)

Both are pure crystallised carbon with the same cubic crystal structure.

Mohs 10

Both are the hardest known natural material, making them equally durable for daily wear.

RI 2.42

Both bend light with the same refractive index, creating the same brilliance.

Fire 0.044

Both produce the same rainbow dispersion and share the same density of 3.52 g/cm³.

Lab-Grown Vs Natural: The Complete Comparison

Everything that matters when choosing a diamond, including quality, beauty, price, ethics and value, in one honest comparison.

Factor Lab-Grown Diamond Natural Diamond
Chemical Composition Pure Carbon Pure Carbon
Crystal Structure Identical Cubic Lattice Identical Cubic Lattice
Hardness Mohs 10 Mohs 10
Brilliance & Fire Identical Identical
Origin Laboratory Grown Earth Formed
Time to Form 2–8 Weeks 1–3.5 Billion Years
Crystal Purity Often Type IIa Usually Type Ia
Inclusions Usually Fewer Natural Inclusions
4Cs Grading Same Standards Same Standards
Certification IGI · GIA · SGL · GCAL IGI · GIA · SGL · GCAL
Visible Difference Not Visible Lab Detection Required
Price 60–85% Lower Premium Pricing
Origin Transparency Fully Traceable Supply Chain Varies
Environmental Impact No Mining Required Mining Required
Availability Produced on Demand Naturally Limited
Resale Market Growing Market Established Market
Best For Value • Size • Ethics Rarity • Tradition

The 4Cs apply identically to both

Independent laboratories grade both lab-grown and natural diamonds using the same standards. A grade means the same on every report.

Cut

The biggest factor in a diamond's sparkle. Always choose an Excellent or Ideal cut.

Colour

Graded from D (colourless) to Z (tinted). Lab-grown diamonds make the D–F colourless range more affordable.

Clarity

Graded from FL to I3 based on inclusions and blemishes at 10× magnification. The same standards apply to both.

Carat

Carat measures weight, not size. Lab-grown diamonds let you buy more carats for the same budget.

Which Should You Choose?

Both are real diamonds. The choice comes down to your priorities, and for most buyers, lab-grown offers the better value.

RatnamLabs Recommends

Choose Lab-Grown If You Want...

✓ Maximum value for your budget

Get a larger or higher-quality diamond for the same spend.

✓ A fully traceable origin

Certified conflict free with complete transparency.

✓ A lower environmental impact

No mining and significantly less land disruption.

✓ More flexibility

Save on the diamond and invest more in your celebration.

Natural May Suit You If...

✓ Geological rarity matters most

You value a diamond formed naturally over billions of years.

✓ You prefer a traditional choice

You appreciate the history, rarity and heritage of mined diamonds.

✓ You're creating a family heirloom

You want a stone to carry through future generations.

Frequently Asked Questions

Are Lab-Grown Diamonds Real Diamonds?

Yes. Lab-grown diamonds are 100% real diamonds. They have the same chemical, physical and optical properties as natural diamonds.

What Is the Difference Between Lab-Grown and Natural Diamonds?

The main difference is how they are formed. Natural diamonds develop inside the Earth over billions of years, while lab-grown diamonds are created in controlled laboratories within a few weeks.

Can You Tell the Difference Between Lab-Grown and Natural Diamonds?

No. Lab-grown and natural diamonds look identical to the naked eye and even to most jewellers using a loupe. Specialised gemological equipment is required to determine a diamond's origin.

Do Lab-Grown Diamonds Last Forever?

Yes. Lab-grown diamonds are just as durable as natural diamonds. They have the same Mohs 10 hardness and will not fade, cloud or lose their sparkle with proper care.

Are Lab-Grown Diamonds Worth Buying?

For many buyers, yes. Lab-grown diamonds typically cost considerably less than comparable natural diamonds, allowing you to choose a larger or higher-quality stone within the same budget.

Contact Us

Still deciding between lab-grown and natural diamonds?

Need expert guidance?

Our diamond specialists are here to help you compare, choose, and buy with confidence.

support@ratnamlabs.com