Lab-Grown vs Natural Diamonds: A Complete Comparison Guide

The question of lab-grown versus natural is one of the most common decisions facing diamond buyers today, and one of the most misunderstood.

Let's clear up the core confusion immediately: lab-grown diamonds are real diamonds. They are chemically, physically, and optically identical to natural diamonds. The only difference is origin. One forms in the earth over billions of years. The other is grown in a laboratory over weeks. Both are genuine diamonds.

This guide offers a practical, buyer-first comparison. It covers everything from formation and appearance to price, value, and ethics. The goal is not to declare a winner, but to help you choose the stone that aligns with your priorities.

The Lab-Grown vs Natural Diamond Shift in Australia

This is not a fringe choice anymore. It is where the Australian market is heading.

According to industry figures reported by the ABC in late 2025, lab-grown diamonds are estimated to hold roughly 50 to 60 per cent of the Australian retail market. The shift is driven largely by younger buyers, including millennials and Gen Z, who prioritise value, transparency and the ability to choose a larger or higher-quality stone within their budget.

As industry observers have noted, lab-grown diamonds are not so much replacing natural diamonds as expanding the market. They are making larger stones and bespoke designs accessible without stretching the budget.

What Are Natural Diamonds?

Natural diamonds crystallised deep within the Earth's mantle under extreme heat and pressure, transforming pure carbon into the diamond lattice structure. Most diamonds crystallise at the base of ancient continental cratons at depths of 150 to 200 kilometres and temperatures of roughly 900 to 1,300 degrees Celsius. Many are more than three billion years old.

Volcanic activity carried them towards the surface in kimberlite pipes, where they are mined, cut, and polished. Only a small fraction of kimberlite pipes contain enough diamond to be economically mined. Each natural diamond is, in effect, a geological time capsule. High-grade, gem-quality natural stones are genuinely rare. That rarity is part of their appeal.

What Are Lab-Grown Diamonds?

Lab-grown diamonds are grown in controlled laboratory environments in a matter of weeks. Two methods dominate production.

High Pressure High Temperature, or HPHT, mimics the heat and pressure of the Earth's mantle. Carbon is exposed to intense conditions until it crystallises into a diamond structure around a tiny seed.

Chemical Vapour Deposition, or CVD, builds a diamond layer by layer. A diamond seed is placed in a vacuum chamber filled with carbon-rich gas, typically methane and hydrogen. The gas is broken down, and carbon atoms settle onto the seed, growing the diamond one microscopic layer at a time.

The resulting material is pure crystallised carbon. It is not an imitation. It is a diamond. The technology has matured so that jewellery-quality stones are produced reliably in many shapes, sizes, and even fancy colours. Global production has scaled rapidly, from roughly 1 million carats in 2010 to over 9 million carats in 2023.

Lab Grown vs Natural Diamonds - The Key Differences

The table below sets out the most important differences between the two types of diamonds.

Origin and Formation

This is the defining difference. Natural diamonds are ancient, formed deep in the earth over billions of years. Lab-grown diamonds are created in laboratories over weeks, using technology that replicates natural conditions. Both are real diamonds. Only the timeline and location differ.

Chemical, Physical, and Optical Properties

Identical. Both are pure carbon with the same crystal lattice. Both score a perfect 10 on the Mohs hardness scale. Both have the same refractive index of 2.42. Both exhibit the same brilliance, fire, and scintillation. A lab-grown diamond is not a copy. It is the same material, produced by a different process.

Appearance to the Eye

There is no visible difference. Neither the naked eye nor a jeweller's loupe can distinguish a lab-grown diamond from a natural one. Only specialised laboratory equipment can detect the subtle differences in growth patterns, fluorescence, or trace elements that reveal origin. This is why the certificate matters. You read the report to know a stone's origin. You do not see it.

Rarity

Natural diamonds are finite and geologically rare. Lab-grown diamonds can be produced at scale. This is a genuine distinction. A natural diamond carries the weight of deep time and limited supply. A lab-grown diamond carries the weight of human innovation and accessible beauty.

Are Lab-Grown Diamonds Real Diamonds?

Yes. Unequivocally.

They are chemically, physically, and optically identical to natural diamonds. They score a perfect 10 on the Mohs scale. They pass a standard diamond tester.

Per GIA's 4Cs education, laboratory-grown diamonds have essentially the same chemical composition, crystal structure, and optical and physical properties as diamonds found in nature. The US Federal Trade Commission, in its revised Jewelry Guides of 2018, removed the word "natural" from the definition of a diamond, on the basis that lab-created stones have essentially the same optical, physical, and chemical properties as mined diamonds and are therefore diamonds.

GIA and IGI both grade and certify lab-grown diamonds. GIA dropped the term "synthetic" from its reports in 2019. A lab-grown diamond is a real diamond.

It is important to distinguish lab-grown diamonds from diamond simulants. Cubic zirconia, which is zirconium dioxide with a Mohs hardness of roughly 8 to 8.5, and moissanite, which is silicon carbide with a Mohs hardness of roughly 9.25, only imitate the look of a diamond. They are not diamonds at all. Lab-grown diamonds are.

Do Lab-Grown and Natural Diamonds Look Different?

No. To the naked eye and even under a jeweller's loupe, they are indistinguishable.

They are the same material with the same optical properties. Only specialised laboratory equipment can tell them apart by detecting subtle differences in growth patterns, fluorescence, or trace elements. Natural diamonds typically contain tiny traces of nitrogen, whereas many lab-grown diamonds, especially CVD-grown stones, contain none. This is one of the markers gemologists rely on to identify origin.

This is why the certificate matters. It is the reliable record of origin. You cannot see the difference. You read it.

Lab Grown VS Natural Diamond: The Difference In Price

Lab-grown diamonds cost significantly less than comparable natural diamonds. The reasons are straightforward: a far shorter, more efficient supply chain and the absence of mining mean lower production costs. Because supply is not constrained by geology, there is no scarcity premium.

Per the Jewellers Association of Australia, lab-grown diamonds are generally 30 to 70 per cent cheaper than natural ones per carat. More recent analysis suggests the gap can be even wider. Diamond analyst Paul Zimnisky has noted that lab-grown prices fell roughly 85 per cent between 2015 and 2025, with comparable lab stones now selling at around a 90 per cent discount to mined equivalents.

The savings widen at larger carat weights, where natural diamond prices rise steeply. This is why lab-grown makes a 2- 3-carat look attainable for many buyers. The price gap reflects supply chain and scarcity, not lower quality. Lab-grown prices are still falling as production scales. For context, wholesale prices for lab-grown diamonds fell about 37 per cent year-on-year in the third quarter of 2025, with 3-carat rounds down 43 per cent.

Value and Resale - The Honest Picture

Honesty is essential here. Most diamonds, mined or grown, sell well below their retail price.

Natural diamonds tend to retain more of their value because of perceived rarity and an established secondary market. Lab-grown diamonds retain relatively little. The Jewellers Association of Australia has put it bluntly, noting that on resale, the intrinsic worth of a lab-grown stone can be effectively the value of the precious metal alone. However, because lab-grown diamonds cost so much less upfront, the actual dollar loss to the buyer can be smaller.

Combined with falling new-stone prices, the takeaway is clear. Buy a diamond, lab-grown or natural, to wear and treasure, not as an investment. The true value of any diamond is the joy it brings, not the number on a resale certificate.

Certification - How Both Are Graded

Lab-grown and natural diamonds are graded on exactly the same 4Cs: cut, colour, clarity, and carat, by the same independent laboratories, principally IGI and GIA, using identical standards.

• Cut refers to how well the diamond is proportioned and how it returns light.

• Colour ranges from D (colourless) to Z (noticeable colour).

• Clarity ranges from Flawless to Included.

• Carat is the weight of the diamond.

A lab-grown diamond's report clearly states that it is laboratory-grown. The stone is laser-inscribed on the girdle. GIA inscribes "laboratory-grown" and issues a distinct Laboratory-Grown Diamond Report. IGI laser-inscribes an "LG" prefix before the report number. There is full transparency.

Always insist on independent certification from a reputable laboratory. Check that the inscription matches the certificate. It is the buyer's protection and the only reliable way to confirm origin.

Which Should You Choose?

This is a decision guided by priorities, not a verdict.

Choose lab-grown if maximising size or clarity within budget matters most or if you appreciate accessible modern luxury. Choose natural if rarity, tradition, geological provenance, and stronger resale retention matter more to you.

There is no wrong answer. Both are real, beautiful diamonds. Many Australians are happily choosing both for different pieces.

At LOHR, our made-to-order approach and Brisbane City showroom allow buyers to see, understand, and choose their stone in person. Our jewellers bring decades of craftsmanship to every consultation, offering quiet guidance rather than sales pressure. The right stone is the one that feels right for you.

Common Myths About Lab-Grown and Natural Diamonds

"Lab-grown diamonds are fake." False. They are real diamonds, identical in composition, recognised as diamonds by the FTC, GIA, and IGI.

"Lab-grown diamonds have no value." They cost less and retain less at resale, but they are genuine diamonds with real beauty and durability. Most diamonds are not investments anyway.

"Lab-grown diamonds will cloud, fade, or yellow over time." False. Their crystal structure is stable, exactly like natural diamonds. Cloudiness is dirt or low clarity, not degradation. This myth often confuses them with simulants like cubic zirconia.

"Lab-grown is automatically the eco-friendly choice." Not necessarily. The footprint depends on the energy used to grow the stone.

"You can spot the difference." You cannot, not by eye or loupe. Only specialised laboratory equipment can distinguish the origin.

Conclusion

Both lab-grown and natural diamonds are real, beautiful diamonds. The choice between them comes down to the buyer's own priorities: budget, size, values, and the meaning they want their piece to carry.

A lab-grown diamond offers the same brilliance, hardness and beauty as a natural diamond, with greater affordability and fewer ethical concerns at the point of origin. A natural diamond carries the weight of deep time, geological rarity, and a different kind of story. Both are valid. Both are genuine.

The right choice is the one that feels right for you. Explore LOHR's lab-grown pieces or speak with the team in Brisbane to see the difference for yourself.

Frequently Asked Questions

What is the price difference between lab-grown and natural diamonds?

Lab-grown diamonds are significantly cheaper, generally around 30 to 70 per cent less per carat than a comparable natural diamond, with some recent analyses putting the gap as high as roughly 90 per cent for like-for-like stones. The difference comes from a shorter supply chain and no scarcity premium, not lower quality. The savings grow at larger carat sizes.

Do lab-grown diamonds look the same as natural diamonds?

Yes. They are visually identical. Neither the naked eye nor a jeweller's loupe can tell them apart, because they are made of the same material. Only specialised laboratory equipment can distinguish origin, which is why the grading certificate is how you confirm whether a diamond is lab-grown or natural.

Do lab-grown diamonds hold their value, and can you resell them?

Most diamonds, mined or grown, sell below their retail price. Natural diamonds tend to retain more of their value, while lab-grown diamonds retain relatively little. Lab-grown prices have continued to fall as production has scaled. They can be resold, but the secondary market is limited. The honest advice: buy a diamond to wear and treasure, not as an investment.

Can a jeweller tell the difference between a lab-grown and a natural diamond?

Not by eye or with a loupe. A jeweller may use screening instruments to flag a likely lab-grown stone, but a definitive determination requires specialised equipment at a grading laboratory such as IGI or GIA. The certificate is a reliable record of origin.

Are lab-grown diamonds more ethical or sustainable than natural diamonds?

It depends. Lab-grown diamonds avoid mining's land disturbance and conflict-diamond concerns, but growing them is energy-intensive. The environmental benefit depends on the energy source; much global production relies on coal-heavy grids. The natural diamond industry has improved traceability and supports communities in some developing nations. Neither is automatically "greener." Weigh the trade-offs against your own values.

Do lab-grown diamonds last, or will they cloud or fade?

They last just as long as natural diamonds. Their crystal structure is stable and will not cloud, fade, or yellow over time. A diamond can look cloudy from dirt or oil build-up, cleaned easily, or from low clarity, but neither is degradation. The fading myth usually stems from confusion with simulants like cubic zirconia.

Are lab-grown diamonds popular in Australia?

Increasingly so. Industry figures reported in late 2025 estimate lab-grown diamonds already account for roughly 50 to 60 per cent of the Australian retail market, with forecasts suggesting this could climb further. The shift is driven largely by younger buyers who value affordability, transparency, and being able to choose a larger or higher-quality stone for the same budget.

Which is better, lab-grown or natural diamonds?

Neither is universally better. Both are real diamonds. Lab-grown suits buyers prioritising size, clarity and value. Natural suits those who value rarity, tradition, and stronger resale retention. The best choice is the one that aligns with your budget, values, and the meaning you want your piece to hold.