Lab-Grown vs Natural Diamonds: The Honest Comparison

If you've started shopping for a diamond recently, you've probably noticed something: half the rings you're looking at are described as "lab-grown", and they cost a fraction of what you expected to pay. Naturally, the first question is whether there's a catch.

As a retailer that sells both lab-grown and natural diamonds, we don't have a horse in this race - we're happy whichever you choose. So here's the genuinely honest comparison: where lab-grown diamonds are identical to natural ones, where they're different, and how to decide which is right for you.

Are lab-grown diamonds real diamonds?

Yes - and this isn't marketing spin. A lab-grown diamond is chemically, physically and optically identical to a natural diamond. Both are pure crystallised carbon with the same hardness (10 on the Mohs scale, the hardest natural material on Earth), the same brilliance and the same fire.

The only difference is origin. Natural diamonds formed deep in the Earth over billions of years. Lab-grown diamonds form in a matter of weeks inside machines that recreate those same conditions of extreme heat and pressure.

A jeweller cannot tell them apart by eye. Neither can you. Distinguishing one from the other requires specialised laboratory equipment that reads the diamond's growth pattern - which is also why grading laboratories laser-inscribe lab-grown diamonds on the girdle (the thin outer edge), so there's never any doubt about what you're buying.

What lab-grown diamonds are not is cubic zirconia or moissanite. Those are diamond simulants - different materials entirely that merely look similar. A lab-grown diamond is a diamond.

How lab-grown diamonds are made

There are two methods, and you'll see both mentioned on certificates:

HPHT (High Pressure, High Temperature)

The original method, developed in the 1950s. A small diamond "seed" is placed in carbon and subjected to pressures and temperatures similar to those found deep in the Earth's mantle. Carbon melts and crystallises around the seed, growing the diamond layer by layer.

CVD (Chemical Vapour Deposition)

The newer and now more common method. A diamond seed is placed in a sealed chamber filled with carbon-rich gas. The gas is heated until carbon atoms separate and rain down onto the seed, building the diamond up over several weeks.

Both methods produce genuine diamonds. Neither is "better" for you as a buyer - what matters is the quality of the finished stone, which brings us to grading.

Are lab-grown diamonds graded the same way?

Yes. Lab-grown diamonds are assessed by the same independent laboratories (such as IGI and GIA) against the same 4Cs - carat, cut, colour and clarity - as natural diamonds. A lab-grown diamond with an excellent cut grade sparkles exactly as much as a natural diamond with an excellent cut grade.

This is worth pausing on, because it's the great equaliser: a poorly cut natural diamond will look duller than a well-cut lab-grown one. Whichever origin you choose, cut quality is the single biggest factor in how beautiful your diamond looks - never compromise on it to chase a bigger carat number.

The price difference: what you actually pay

Here's where the two genuinely part ways. Lab-grown diamonds typically cost 60–80% less than natural diamonds of equivalent size and quality, and the gap has widened as production has scaled up.

In practical terms, that means a budget that buys a modest natural solitaire can buy a lab-grown centre stone of well over a carat, in a higher colour and clarity grade. For many couples, the choice isn't really "lab vs natural" - it's "smaller natural stone vs noticeably larger or finer lab-grown stone at the same price".

There's no quality trade-off hiding in that discount. The price difference reflects supply: natural diamonds are mined in limited quantities, while lab-grown production increases every year.

The honest downside: resale value

This is the part many retailers gloss over, so let's not.

Natural diamonds hold value better than lab-grown diamonds. Because lab-grown supply keeps growing and production costs keep falling, the resale market for lab-grown stones is weak, and a lab-grown diamond bought today will likely be worth significantly less in future. Natural diamonds aren't an investment either - retail markups mean you'd rarely recoup the purchase price - but they retain a meaningful portion of their value, and rare, high-quality natural stones can appreciate.

The honest framing: if you think of your diamond as a possession you'll keep for life, resale value is close to irrelevant, and lab-grown is extraordinary value. If the idea of owning something with enduring market value matters to you - emotionally or financially - that's a genuine reason to choose natural.

Sustainability and ethics

Lab-grown diamonds avoid mining altogether, which eliminates concerns about land disruption and conflict stones, and is a major reason younger buyers choose them. They're not impact-free - growing diamonds is energy-intensive, and the footprint depends on the energy source the producer uses - but the supply chain is short and traceable.

Natural diamonds have improved enormously too. Stones sold by reputable Australian retailers are certified through the Kimberley Process, which exists to keep conflict diamonds out of the legitimate supply chain, and the industry supports significant employment in producing countries.

Neither choice is automatically "the ethical one". If provenance matters to you, the practical advice is the same for both: buy certified stones from a retailer who can tell you where they came from.

Lab-grown vs natural diamonds at a glance

So which should you choose?

There's no wrong answer, but there are better answers for you:

Choose lab-grown if…

You want the biggest, best-quality stone your budget allows; you're drawn to the mining-free origin; or you simply can't justify paying several times more for a stone that looks identical. This is why lab-grown now dominates engagement ring sales - see our lab-grown diamond engagement rings to compare for yourself.

Choose natural if…

The billion-year origin story is part of the romance for you; you're buying a piece you hope will carry heirloom value; or you want a stone whose worth is underpinned by genuine rarity. Browse our natural diamond jewellery to see the range.

Or judge by the piece, not the label

Plenty of our customers choose lab-grown for the engagement ring centre stone and natural for anniversary pieces, or vice versa. Every diamond in our Boutique Diamonds collection - lab-grown and natural alike - is held to one quality standard, F colour and VS clarity, so you can compare the two origins like for like.

Frequently asked questions

Can a jeweller tell a lab-grown diamond from a natural one?

Not by eye, and not with a standard loupe. Identification requires specialised laboratory equipment. Certified lab-grown diamonds also carry a microscopic laser inscription on the girdle stating their origin.

Do lab-grown diamonds get cloudy or fade over time?

No. A lab-grown diamond is as permanent as a natural one - it won't cloud, fade, yellow or lose its sparkle. Both need only the same occasional cleaning.

Will a lab-grown diamond pass a diamond tester?

Yes. Standard diamond testers measure thermal and electrical conductivity, and lab-grown diamonds respond exactly as natural diamonds do - because they are diamonds.

Are lab-grown diamonds cheaper because they're lower quality?

No. They're cheaper because they can be produced at scale, while natural diamonds must be mined. Quality varies in both categories, which is why independent certification matters for either choice.

Are lab-grown diamonds popular in Australia?

Very - they now account for a large and growing share of engagement ring purchases in Australia, driven by the value equation: a substantially larger or finer stone for the same budget.

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