Most advice on lab-grown diamonds asks you to pick a side. You’re either smart for saving money or loyal for buying mined. That’s the biggest myth of all, because good jewellery decisions come from understanding the options, not joining camps.
Myth 1: lab-grown means fake
This confusion is easy to understand. High street windows have displayed diamond lookalikes for years, and cubic zirconia and moissanite are the two names buyers hear most often. Both can flash nicely in a ring. Neither is a diamond.
Cubic zirconia is zirconium oxide, while moissanite is silicon carbide. They copy the look of diamond but don’t share its chemical makeup. Moissanite even throws more rainbow fire than diamond does. That extra fire is often how a trained eye identifies it.
A lab-grown diamond is a different thing entirely. It is pure crystallised carbon, with the same hardness and light response as a mined stone. A standard thermal tester will read both as diamond. That’s because both are genuine diamonds.
The difference is where the crystal formed. One formed deep in the earth, while the other formed in a lab under controlled conditions. Growers start with a diamond seed, which is a thin slice of real diamond crystal.
In the HPHT process, that seed is placed in pure carbon and held under high pressure and high temperature until new diamond grows around it. In the CVD process, the seed is placed in a sealed chamber containing carbon-rich gas. The gas is heated until it breaks apart. Carbon atoms then settle on the seed and build diamond layer upon layer.
Shops sometimes blur these terms. They say synthetic and buyers hear fake. In gem talk, synthetic simply means lab-made with the same makeup, while simulant means a material with a different makeup. Lab-grown diamonds sit in the first group. Cubic zirconia and moissanite sit in the second. Keep those groups separate and much of the sales talk becomes clearer.
Myth 2: an expert can tell by looking
Buyers often ask whether it’s possible to tell just by looking. Colour and sparkle won’t reveal the answer, and weight won’t either. A well-cut lab-grown diamond and a well-cut mined diamond look the same face-up. Even with a loupe, you won’t see a clear label identifying the stone’s origin.
Standard diamond testers don’t solve the problem. Those handheld tools measure heat flow, and diamond moves heat quickly. Mined and lab-grown stones move heat in the same way, so both will beep as diamond. That test weeds out simulants such as cubic zirconia and moissanite. It can’t separate lab-grown diamonds from mined ones.
Labs use deep-UV light and growth-pattern checks to establish origin. Those machines belong in grading rooms rather than on the shop counters where most jewellery is sold day to day. Serious checks need specialist lab equipment. Growth traces show under deep-UV imaging, while element patterns appear under spectral scans. Those tools cost far more than a standard counter tester.
That’s why high grades should always link back to a report. Trust the paperwork that matches the stone rather than boasts about unusually sharp eyes.
Looks alone can’t settle it.
Inclusions won’t settle it either. Diamonds from both origins can have internal marks. HPHT stones can show tiny metallic flux traces under high magnification, while CVD stones can display fine growth lines. Mined stones have their own crystals and feathers, and there is some overlap between them.
Fluorescence is the same story. Some mined diamonds glow blue under UV light, and some lab-grown diamonds do too. It affects their appearance in the same way. On its own, it doesn’t prove the diamond’s origin.
Myth 3: paperwork is just admin
This is where buyers gain real control over the comparison. Don’t judge two stones by photos alone. Compare them using their matching reports. GIA and IGI both grade lab-grown diamonds, and both state the origin plainly on the report. That wording matters because it keeps the sale clear.
Ask to see the full grading report before comparing prices. If you’re searching for lab grown diamonds perth, the first thing to request is the grading report, which any reputable jeweller will show without hesitation alongside a mined comparison stone. Check carat, cut, colour and clarity side by side, along with polish and symmetry. Two lab-grown stones with the same grades should sit in the same general price band.
Most lab-grown diamonds carry a laser inscription on the girdle. It says laboratory grown and includes the report number. You won’t see it with the naked eye, but a jeweller can show it under magnification. Match that number to the report in your hand. This small step prevents mix-ups and also helps later if the ring needs repair or a valuation.
Trade rules support this approach. In the US, the 2018 update to the Jewelry Guides said lab-grown stones are diamonds as long as sellers state their origin. That is why reports now use clear terms such as laboratory-grown. You should hear equally clear language at the counter. If the discussion of origin feels vague, ask direct questions until the answer is clear.
Myth 4: a lower price means lower quality
Lab-grown diamonds often sell for a third to half less than mined stones with the same grades. That’s a wide gap, and it can make buyers nervous. They may assume something must be wrong. There is nothing wrong with the crystal itself.
The gap comes from production time and supply. A factory can grow new rough in weeks, while a mine must move tonnes of rock to find a few carats of gem rough. Lab production also has no pits to operate or long haul chains to fund.
Both are graded on exactly the same 4Cs. Carat, cut, colour and clarity mean the same thing for either origin. A one-carat round with excellent cut is judged to the same standard. Lab-grown stones cover the full quality range, from heavily included examples to flawless stones. Most sit somewhere in the middle, just like mined goods.
That price gap changes what your budget can do. The same money might buy a larger face-up size, a whiter colour or cleaner clarity. Those trade-offs are personal. Some buyers prioritise size for an engagement ring, while others prefer a cleaner stone for studs they plan to wear daily.
Cut deserves extra care. A fine cut can make a mid colour look bright, while a poor cut can leave a high colour looking dull. Lab-grown rough is cut into the same shapes as mined rough, and rounds and ovals can both cut well. Judge light return first. Then weigh colour and clarity against your taste and your purse.
Price doesn’t tell you which stone is better made. The certificate gives you the information needed to make that judgement.
Myth 5: lab-grown is automatically the green choice
Many buyers hope lab-grown means kinder to the earth. There is some truth in that hope. Growing diamonds avoids open pits, along with moving vast quantities of rock and using vast amounts of water on site. That’s a real difference that is easy to picture. Mining leaves a mark that can be seen from far away.
Lab creation has its own demands. Furnaces and reactors run hot for weeks, drawing a steady supply of power. If that electricity comes from coal, the footprint grows quickly. If it comes from hydro or solar, the calculations look better. Most sales staff won’t know the grower’s energy mix offhand, but a good one will find out.
Empty green labels don’t help. Treat words such as eco and sustainable as prompts to request proof rather than proof in themselves. Ask where the stone was grown, what powered the plant and whether the origin can be included in writing on the invoice. Clear sellers should be able to answer directly.
Mined diamonds have a different paper trail. The Kimberley Process tracks rough diamonds to curb conflict stones, although it has gaps and doesn’t cover all harms. Lab-grown stones sit outside that system and don’t fund pit wars. That makes them different rather than automatically pure. Ask for facts, not slogans, then weigh both sides with the same level of care.
Myth 6: a diamond should hold its value
Some buyers treat a diamond like shares, but most jewellery won’t work that way. Retail prices cover cutting and shop costs, and resale rarely recovers those expenses. Mined stones retain some second-hand trade. Lab-grown stones retain very little. That’s the honest position, and buyers should hear it before paying.
That doesn’t mean the money is wasted. The value sits on the finger rather than waiting in a safe. A well-cut stone worn each day provides daily enjoyment. Think in terms of lifetime wear value, including whether you will still love the shape in ten years and whether the setting suits both work and weekends. Those answers matter more than guesswork about future prices.
Cover that value in the right way. Insure the piece for replacement cost, and keep the grading report and receipt together with photos. Ask whether your policy pays for a like-for-like new stone. Most policies do.
That paperwork helps a jeweller remake the piece if it is lost. Resale predictions may fade, but regular wear and suitable cover remain useful.
Myth 7: lab-grown is a passing fad
Some shoppers worry lab-grown diamonds will date quickly. The trade signs point in the other direction. De Beers sells lab-grown stones through its Lightbox line, and the world’s best-known miner would not back a joke product. High street chains now display lab-grown and mined diamonds side by side. That shelf space tells its own story.
Forecasts point to steady growth. The synthetic diamond market is tipped to reach US$24.4 billion by 2030 (GlobalData). That’s more than a niche blip, with demand coming from engagement rings and fashion pieces alike. Labs continue improving clarity and size, while prices keep finding new bands. Dismissing the entire category as a fad sits oddly beside those numbers.
Perth buyers have experienced this shift firsthand. Rio Tinto closed its Argyle mine in 2020. That pit supplied the world with its famed pink diamonds, and its closure removed a home source that buyers knew by name. Since then, more local jewellers have stocked certified lab-grown options next to mined stones. Couples can compare both during one visit and weigh size against grade with clear eyes. Choice has grown even as one mine has closed.
Lab-grown and mined stones can both make fine jewellery. Certificates and clear conversations matter more than myths about origin. Buy the stone that fits your hand and your budget, then wear it hard. If a stone is certified and you love how it looks, its origin can remain a detail rather than a verdict.
