Natural vs Lab-Grown Diamonds

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Natural Diamonds vs Synthetic Lab-Grown Diamonds

A natural diamond and a synthetic lab-grown diamond may look identical in a photograph. They share the same chemical composition — both are crystallised carbon. But that is where the similarity ends. One is a miracle of nature, formed over billions of years deep within the earth, finite in supply, and genuinely rare. The other is a man-made, synthetic product, manufactured in an industrial factory, available in unlimited quantities, and declining in value every year.

At Diamond Imports, we sell natural diamonds only. We always have and we always will. This page explains why — honestly, with data, and without apology.

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The Word “Synthetic” — And Why the Industry Tried to Bury It

For decades, the correct and standard industry term for a man-made diamond was synthetic diamond. This was the terminology used by the FTC — the Federal Trade Commission, the United States government body responsible for consumer protection and trade regulation in the jewellery industry — by GIA, and by the international diamond trade worldwide.

Why does a US government body matter to a buyer in Australia? Because the FTC's Jewelry Guides are the most influential consumer protection standard in the global diamond industry. They are the benchmark that GIA — the world's most respected diamond grading laboratory — aligns with. And because what GIA does, the entire international diamond trade follows. When the FTC changes its guidelines, the ripple effects reach every diamond market in the world — including Australia.

The 2018 Ruling — What Changed and Why It Matters

In 2018, the FTC updated its Jewelry Guides for the first time in over 20 years. The lab-grown diamond industry — which had grown significantly and had a strong commercial interest in how its products were described — was an active participant in lobbying for those changes. Two specific changes were made, both of which significantly benefited the commercial interests of man-made diamond producers:

1. The word “natural” was removed from the FTC's definition of diamond. The previous definition read: “a natural mineral consisting essentially of pure carbon.” The updated definition simply dropped the word “natural.” This allowed man-made synthetic diamonds to be marketed simply as “diamonds” — without any qualifier to distinguish them from stones formed in the earth. A product that had always required the qualifier “lab-grown” or “synthetic” before the word diamond could now be called simply “a diamond” in marketing materials.
2. The word “synthetic” was removed from the FTC's list of recommended descriptors for man-made diamonds. The lab-grown industry had argued to the FTC that consumers confused “synthetic” with “simulated” — equating their product with cubic zirconia or other diamond simulants. The FTC accepted this argument and dropped “synthetic” from its suggested terminology, even though it remained technically accurate and legally permissible.

GIA's Response — And Its Global Consequences

GIA — the Gemological Institute of America, whose grading reports are the global standard for diamond certification — aligned itself with the new FTC guidelines immediately. From July 2019, GIA stopped using the word “synthetic” on its identification and grading reports for man-made diamonds.

Because GIA's reports are accepted and referenced by diamond dealers, jewellers, insurers, and consumers in every country in the world — including Australia — this decision had immediate global consequences. Overnight, the standard language for evaluating and describing man-made diamonds changed everywhere. The word “synthetic” — which had been the accurate, consumer-protective term for these stones — was quietly retired from the most important documentation in the industry.

The result was a marketing transformation. A product previously understood to be a synthetic man-made copy of a natural diamond was now simply a “lab-grown diamond” — a term that implies something organic, precious, and responsibly created. The factory, the industrial presses, the coal-powered electricity, the 24-hour production lines: none of that is evoked by the word “grown.”

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What Is a Synthetic Lab-Grown Diamond?

A synthetic lab-grown diamond is a man-made stone produced in an industrial facility using one of two methods:

• HPHT (High Pressure High Temperature) — carbon is subjected to extreme pressure and temperatures exceeding 1,000°C in industrial presses, replicating in weeks what nature took billions of years to create.
• CVD (Chemical Vapour Deposition) — carbon-rich gas is introduced into a reactor chamber and deposited onto a substrate to grow a synthetic diamond crystal. Also highly energy-intensive and requires continuous industrial operation.

Both methods produce a stone with the same chemical formula as a natural diamond — crystallised carbon — and the same hardness on the Mohs scale. But they are not natural diamonds. They are synthetic copies — man-made replications of a natural object, produced in a factory, on demand, at industrial scale. The distinction matters for one fundamental reason: a natural diamond is rare and finite. A synthetic diamond is not.

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Rarity — The Difference That Defines Everything

A natural diamond began forming between one and three billion years ago, at depths of 150 kilometres or more beneath the earth's surface, under conditions of extreme heat and pressure that existed only in specific geological zones. It was then carried to the surface over millions of years by volcanic activity. The precise combination of conditions required to create a gem-quality natural diamond is extraordinarily rare. That is why they are rare. That is why they have always been rare.

There is a finite amount of gem-quality natural diamonds in the world. Major diamond mines are depleting. The Argyle mine — one of the world's largest diamond producers — closed permanently in 2020. New significant discoveries are increasingly rare. The supply of new natural diamonds entering the market is gradually, irreversibly decreasing.

A synthetic diamond, by contrast, can be produced in weeks. The machines that make them run 24 hours a day, 7 days a week, 365 days a year. There is no natural limit on supply. If demand exists, more can simply be manufactured. This is the definition of a commodity — an interchangeable, reproducible industrial product with no inherent scarcity.

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The Price Collapse of Synthetic Diamonds — The Data

Nothing exposes the true nature of a commodity like its price trajectory. The price history of synthetic lab-grown diamonds is unambiguous.

• In 2015, synthetic lab-grown diamonds were approximately 30% cheaper than equivalent natural diamonds
• By 2020, they were 50–60% cheaper
• By 2025, man-made diamonds are 80–85% cheaper than natural equivalents — and still falling
• The average price of a one-carat synthetic diamond fell from $3,410 in January 2020 to just $892 in December 2024 — a collapse of 74% in four years
• In Q3 2025, lab-grown wholesale prices fell a further 37% year-on-year, with three-carat rounds declining 43% in a single year
• On the secondary market in 2025, synthetic diamonds retain only 30–40 cents in the dollar

This is not a temporary correction. This is what happens when a commodity is manufactured at industrial scale with no supply constraint. As production technology improves and more factories come online, the price will continue to fall. There is no floor.

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GIA Has Stopped Grading Lab-Grown Diamonds the Same Way

In late 2025, GIA stopped using its traditional colour and clarity grading scale for lab-grown diamonds. Since 2022, 95% of all synthetic diamonds submitted to GIA received D, E, or F colour grades and 98% received VS1 or better clarity. When virtually every manufactured stone is technically “perfect” by the scale, the grading system becomes meaningless. GIA replaced full grading reports for synthetic stones with just two descriptive categories: Premium and Standard.

In natural diamonds, a D colour Flawless stone represents a tiny fraction of a percent of all diamonds ever found. That rarity is real, geological, and cannot be manufactured.

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The Environmental Reality of Synthetic Diamond Production

• HPHT production requires 250–750 kilowatt-hours of electricity per carat — equivalent to a month of Australian household electricity per stone
• Without renewable energy, the carbon footprint of a synthetic diamond is 150–480 kg CO₂ per carat — potentially exceeding the footprint of mining natural diamonds
• Over 60% of lab-grown diamonds worldwide are produced in China and India — where coal represents 63% and 74% of national electricity supply respectively
• These factories run continuously, burning coal-generated electricity 24 hours a day, to produce a commodity whose price falls every quarter

The “eco-friendly” marketing of synthetic diamonds applies only to a minority of producers using renewable energy. For the bulk of global production — manufactured in coal-dependent countries with limited environmental regulation — the environmental credentials do not hold up.

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Sentimental Value — The Difference You Can't Manufacture

A natural diamond was formed before the dinosaurs existed. It survived volcanic eruptions, plate tectonics, and billions of years underground before arriving in a ring. That story is real. It cannot be replicated.

A 2024 study found that while 78% of consumers acknowledged the visual equivalence of lab-grown and natural diamonds, only 23% attributed any “emotional value” to synthetic stones — compared to 89% for natural diamonds. People understand, instinctively, that a synthetic copy is not the same as the original.

Not everyone can own a natural diamond. That remains true. And it always will be.

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Diamond Imports — Natural Only, Always

Diamond Imports has never sold a synthetic, man-made, or lab-grown diamond and never will. Every stone we sell is a natural diamond, independently certified by GIA, DCLA, or HRD, and hand-selected with care. If you have questions about the natural versus synthetic distinction — or have been offered a lab-grown diamond and want an independent assessment — we will give you an honest, straightforward answer.

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