15 Common Myths About Lab-Grown Diamonds, Debunked

Fact: Laboratory-grown diamonds are diamond material, but they are laboratory-grown rather than naturally formed.

This is probably the most common misconception.

Laboratory-grown diamonds have essentially the same chemical composition, crystal structure and physical and optical properties as natural diamonds. The major difference is how they formed.

Natural diamonds formed through geological processes within the Earth. Laboratory-grown diamonds are produced technologically, principally through High Pressure High Temperature (HPHT) or Chemical Vapour Deposition (CVD).

That makes origin important — but it does not make laboratory-grown diamond an imitation material.

For marketing and product disclosure, the qualifier laboratory-grown should remain clear. Buyers should never be led to believe a laboratory-grown diamond is a naturally formed stone.

For the complete authenticity explanation, see Are Lab-Grown Diamonds Real?

Laboratory-grown origin changes where the crystal formed — not what it is made of.

Fact: They are three different materials.

Cubic zirconia and moissanite can both be used as diamond alternatives, but neither is diamond.

Cubic zirconia is zirconium dioxide. Moissanite is silicon carbide. Laboratory-grown diamond is diamond crystal.

Those differences lead to different physical and optical properties.

This is why the terms should not be used interchangeably. Calling a laboratory-grown diamond "CZ" or "moissanite" is gemmologically incorrect.

If your decision specifically involves these alternatives, use Aurelia Royale's dedicated Lab-Grown Diamond vs Cubic Zirconia and Lab-Grown Diamond vs Moissanite guides.

Fact: Visual inspection alone is not a reliable origin test.

A well-cut laboratory-grown diamond and a comparable natural diamond can appear extremely similar under ordinary viewing conditions.

There is no universal visual rule saying laboratory-grown diamonds look too perfect, too bright, too blue, too grey or somehow artificial.

GIA explains that laboratory-grown and natural diamonds share so many chemical and optical characteristics that traditional gemmological observations alone cannot reliably separate them in every case.

Professional identification can involve growth features, inclusions, luminescence, spectroscopy and other specialised testing.

For the complete testing hierarchy, see Can You Tell a Lab-Grown Diamond from a Natural Diamond?

Fact: A positive basic diamond-test result usually establishes material properties — not geological origin.

Many conventional handheld diamond testers measure characteristics such as thermal conductivity.

Laboratory-grown diamonds possess diamond's relevant physical properties, so they can produce the same type of positive response as natural diamonds.

The tester has not been "fooled". It is simply answering: "Does this material behave like diamond?" — which is different from "Did this diamond form naturally within the Earth?"

Professional natural-versus-laboratory screening uses substantially more sophisticated technology.

Some screening systems also produce results such as PASS and REFER rather than making a simple natural/lab declaration. A referred stone requires further testing; "refer" does not automatically mean laboratory-grown.

Fact: Laboratory-grown diamonds possess diamond's characteristic hardness and are suitable for regular jewellery wear.

Diamond is exceptionally resistant to scratching, and laboratory-grown diamond shares this property.

But there is an important correction to make.

Hardness is not the same as indestructibility.

Diamond can still chip or fracture when struck strongly in a vulnerable direction. GIA distinguishes hardness from toughness and specifically notes that even diamond can chip during normal wear if sufficiently impacted.

This applies to both natural and laboratory-grown diamonds.

The setting matters too. A damaged prong, exposed corner or very thin girdle can increase risk regardless of diamond origin.

For practical wearing guidance, see Are Lab-Grown Diamonds Suitable for Regular Wear?

Fact: Laboratory-grown origin does not cause a diamond to gradually turn cloudy simply because it gets older.

When a diamond that once appeared bright begins to look dull, surface contamination is often worth investigating.

Skin oils, soap, moisturiser and cosmetics can accumulate on diamond surfaces and around settings, interfering with light performance.

However, "cloudy" can describe several different conditions.

A diamond can contain an internal clarity characteristic called a cloud. It can show other internal graining or growth characteristics. Poor cut can create a dark or lifeless appearance. Damage can also alter the way the stone looks.

Those issues should not all be diagnosed as ageing.

For troubleshooting, see Can Lab-Grown Diamonds Become Cloudy? and for brilliance specifically, use Aurelia Royale's dedicated Do Lab Diamonds Lose Their Sparkle? guide.

Fact: Laboratory-grown does not mean flawless.

Lab-grown diamonds can contain inclusions, graining and growth-related characteristics.

Different growth environments can produce different types of features. HPHT-grown diamonds may display characteristics associated with metallic flux, while some CVD-grown diamonds can show growth-related graining or other features.

Individual stones can therefore receive very different clarity assessments.

Controlled production does not mean a manufacturer simply presses a button and receives a flawless finished diamond.

The rough crystal also has to be planned, cut and polished.

A laboratory-grown diamond can consequently be outstanding, average or unsuitable for a particular jewellery application.

Fact: Individual lab-grown diamonds vary significantly.

Origin is only one characteristic.

Diamonds can differ in: cut and proportions, colour, clarity, carat weight, physical dimensions, polish, symmetry, fluorescence, growth characteristics, and overall visual performance.

Two laboratory-grown diamonds of exactly the same carat weight may not even appear the same physical size.

Likewise, two stones with similar colour and clarity information can differ in their proportions and light behaviour.

This is why a buyer should evaluate the individual diamond, rather than assuming that choosing "lab-grown" finishes the quality decision.

See What Are the 4Cs of Lab-Grown Diamonds? for the main quality framework and Carat Weight vs Diamond Size for the difference between weight and visible dimensions.

Fact: Major gemmological laboratories evaluate laboratory-grown diamonds — but their current reporting systems are not all identical.

IGI continues to issue Laboratory Grown Diamond Reports documenting characteristics including carat weight, colour, clarity and cut where applicable.

GIA changed its system for colourless-to-near-colourless laboratory-grown diamonds on October 1, 2025.

Instead of using the natural-diamond nomenclature in the same way, GIA now offers a Laboratory-Grown Diamond Quality Assessment that classifies eligible loose stones as Premium or Standard, based on combined colour, clarity and finish criteria.

GIA's current laboratory-grown services also use a distinct report format and laser-inscribe qualifying stones with "Laboratory-Grown" and the assessment number.

So the myth is wrong — but saying "lab-grown diamonds are graded exactly the same as natural diamonds by every laboratory" would also be wrong in 2026.

Always identify which laboratory issued the document and understand what its specific report actually means.

For deeper guidance, see Does Every Lab Diamond Need Certification? and How to Read a Lab-Grown Diamond Certificate.

Fact: Price and gemmological quality are related, but origin creates a separate economic difference.

Laboratory-grown and natural diamonds operate under different supply conditions.

Natural diamonds depend on geological deposits and mining. Laboratory-grown diamonds can be produced through manufacturing capacity that can expand and improve as technology develops.

That difference contributes to the large price gap commonly seen between the two categories.

It does not mean every lower-priced laboratory-grown diamond is lower in cut, colour or clarity than every more expensive natural diamond.

At the same time, "lab-grown" does not automatically mean bargain.

A poorly cut diamond remains poorly cut regardless of how it formed.

Price should therefore be evaluated separately from quality.

For the complete economic explanation, see Are Lab-Grown Diamonds Cheaper Than Natural Diamonds?

Fact: "Worthless" is too absolute — but resale expectations need to be realistic.

Purchase value and resale value are not the same thing.

Laboratory-grown diamonds are commercially sold gemstones with retail value, but a future buyer may not pay anything close to the original retail price.

Their secondary market is also different from that of natural diamonds.

Laboratory production can increase over time, technology can improve and comparable new stones can become less expensive. Those factors can put pressure on resale prices.

Natural diamonds have a more established secondary market, but purchasing an ordinary natural-diamond jewellery piece also does not guarantee recovery of its original retail price.

The correct conclusion is neither: "Lab-grown diamonds are worthless." nor: "They will retain their retail value."

For the full subject, see Do Lab-Grown Diamonds Have Resale Value?

Fact: Jewellery should not be presented as a guaranteed appreciating financial asset.

A diamond may have monetary value while still being a poor candidate for speculative investment.

Retail jewellery prices can include much more than the secondary-market value of the loose centre stone: precious metal, design, setting, manufacturing, distribution, retail overhead and taxes can all contribute.

A future purchaser does not necessarily reimburse those costs.

Laboratory-grown diamond prices can also respond to technological improvements and changing manufacturing supply.

For most consumers, the stronger reason to buy a lab-grown diamond is therefore wearing value: appearance, design, sentimental meaning and enjoyment.

If investment performance is your principal objective, it should be analysed separately from jewellery purchasing.

Fact: Laboratory-grown diamonds can be used in fine jewellery and jewellery intended for regular wear.

Their diamond properties make them suitable for engagement rings, earrings, necklaces, bracelets and other pieces.

But this does not mean every finished product is automatically high quality.

A durable diamond held by a weak setting still makes a weak piece of jewellery.

Likewise, metal quality, prong security, clasp construction, dimensions, finishing and comfort all contribute to the quality of the finished item.

The correct conclusion is therefore: lab-grown diamonds are suitable for fine jewellery, but diamond origin alone does not determine finished-jewellery quality.

See Are Lab-Grown Diamonds Suitable for Fine Jewellery?, What Makes Lab-Grown Diamond Jewellery High Quality? and Are Lab-Grown Diamonds Suitable for Regular Wear?

Lab-grown diamonds are fully suitable for fine jewellery — the quality of the setting and construction matters just as much as the diamond.

Fact: Laboratory-grown origin alone does not prove the environmental impact of a product.

Creating a diamond in a laboratory eliminates the need to mine that particular diamond from a geological deposit.

That is a real difference.

But laboratory growth still requires manufacturing equipment and energy. The diamond must also be cut and polished, and the finished jewellery may involve precious-metal production, transport, manufacturing and packaging.

The environmental footprint can therefore vary according to electricity source, production efficiency, location and the wider supply chain.

This is precisely why broad environmental claims such as "eco-friendly", "green", "carbon neutral" or "sustainable" require substantiation rather than assumption.

For UK-facing marketing, the Competition and Markets Authority's Green Claims Code requires environmental claims to be truthful, accurate and supported by appropriate evidence.

Fact: Origin answers one supply-chain question, not every ethical question.

A laboratory-grown diamond is manufactured rather than mined.

For buyers whose concern specifically relates to diamond mining, that distinction can be meaningful.

But an entire piece of jewellery involves more than the diamond-growth chamber.

Questions can also relate to energy, labour conditions, cutting and polishing, precious-metal sourcing, manufacturing, transport and other stages of production.

The word ethical can therefore cover many different criteria.

A seller should support specific claims with evidence rather than implying that laboratory-grown origin automatically proves every element of the supply chain meets a particular ethical standard.

A more transparent approach is to explain what is known and verifiable about the product rather than attaching a universal ethical label.

Most misinformation about laboratory-grown diamonds comes from treating one characteristic as if it answered every other question.

"Laboratory-grown" tells you origin.

It does not automatically tell you: how well the diamond is cut, whether it is flawless, whether the jewellery is well made, how much the piece should cost, what it could resell for, how a specific factory is powered, or how every part of the supply chain operates.

Likewise, "natural" tells you geological origin. It does not automatically guarantee superior cut, flawless clarity, perfect workmanship or financial appreciation.

Better buying decisions come from separating these questions.

One final misconception sits behind several of the myths above: that terminology does not matter as long as a stone "looks like a diamond".

It does matter.

In the United States, FTC guidance requires laboratory-created diamonds to be described using clear wording such as laboratory-grown or laboratory-created so consumers understand that they are not mined stones.

UK advertising requirements are similarly strict about origin disclosure.

The ASA advises marketers to use clear and prominent qualifiers such as laboratory-grown, laboratory-created or synthetic rather than describing laboratory-grown products simply as unqualified "diamonds" or "real diamonds" in advertising.

For Aurelia Royale, clear laboratory-grown diamond wording should therefore remain consistent throughout educational and commercial content.

Clear laboratory-grown labelling protects buyers and meets advertising requirements in both the UK and US.

Lab-grown diamonds are neither the miracle product described by their most aggressive promoters nor the "fake diamonds" portrayed by their harshest critics.

They are laboratory-grown diamonds.

That means they are diamond material produced technologically rather than by natural geological processes.

They can be beautiful. They can be durable. They can be well cut or poorly cut. They can contain inclusions. They can be independently assessed. They can be used in fine jewellery and regular-wear jewellery.

Their prices and resale dynamics differ from natural diamonds. And their environmental or ethical credentials should be supported by evidence rather than assumed.

Once those facts are separated from the marketing extremes, the buying decision becomes much simpler.

Understanding the myths helps you compare jewellery using facts rather than assumptions.

Explore Aurelia Royale's laboratory-grown diamond jewellery and review the individual diamond and product specifications relevant to the design you are considering.

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