Natural or Laboratory-Grown? How Can You Tell What Diamond Is in Your Ring?

 

Buying a diamond is a significant investment, and for many people, understanding exactly what they own is just as important as the beauty of the stone itself.

Today, consumers have more choice than ever. Alongside natural diamonds, laboratory-grown diamonds are widely available and can look virtually identical to the unaided eye. Both can be beautiful, durable and suitable for jewellery — but they are not the same type of diamond, and their values, origins and market characteristics can be very different.

So, if you already own a diamond ring, or you are considering buying one, how can you tell whether the diamond is natural or laboratory-grown?

The short answer is: you generally cannot tell reliably by looking at the diamond or using a basic diamond tester.

Why Natural and Laboratory-Grown Diamonds Look So Similar

A laboratory-grown diamond is not simply a diamond imitation.

Unlike cubic zirconia or many diamond simulants, laboratory-grown diamonds have essentially the same chemical composition and crystal structure as natural diamonds. They are created using advanced technology that replicates some of the conditions under which diamonds form naturally.

The two main laboratory-growing technologies are:

• HPHT — High Pressure High Temperature
• CVD — Chemical Vapour Deposition

Because laboratory-grown diamonds are genuine crystalline diamond material, many traditional diamond testing instruments will identify them as diamond.

That is where the confusion can begin.

A tester telling you that your stone is a diamond does not necessarily tell you whether it is a natural diamond or a laboratory-grown diamond.

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What Can a Basic Diamond Tester Tell You?

Many jewellery stores, pawnbrokers and consumers use handheld diamond testers.

These devices are useful as a first screening tool. Depending on the type of tester, they may measure properties such as thermal conductivity or electrical conductivity to determine whether a stone behaves like diamond.

For example, a basic thermal diamond tester may indicate:

“Diamond.”

That can be useful information — but it does not necessarily mean:

“Natural diamond.”

A laboratory-grown diamond can also test as diamond because it is diamond.

The limitation is important

A basic diamond tester is generally designed to distinguish diamond from certain simulants. It is not a definitive origin test.

This means a consumer should be cautious about relying on a handheld tester as proof that a diamond is natural.

Some more advanced screening instruments can identify characteristics associated with laboratory-grown diamonds and can help separate natural diamonds from laboratory-grown stones. However, screening is still different from issuing an independent grading report.

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Can You Tell by Looking at the Diamond?

In most cases, no.

Natural and laboratory-grown diamonds can both display:

• Excellent brilliance
• Fire and scintillation
• Similar colour grades
• Similar clarity characteristics
• Similar cuts and proportions
• Exceptional hardness

To the unaided eye, even an experienced jewellery professional may not be able to determine the origin of a diamond simply by examining it.

This is particularly important when buying a second-hand ring, inherited jewellery or a diamond without documentation.

The fact that a diamond looks beautiful does not tell you whether it is natural or laboratory-grown.

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What About a Loupe?

A jeweller’s loupe can reveal inclusions and other characteristics inside a diamond, and an experienced gemmologist may sometimes recognise features that suggest a particular origin.

However, a loupe is not a substitute for laboratory testing.

Laboratory-grown diamonds can contain distinctive growth features, and natural diamonds can contain a wide variety of inclusions and characteristics. Some observations can raise suspicion or indicate that further testing is required, but visual examination alone should not be treated as definitive proof of origin.

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What About the Laser Inscription?

One of the most useful things a consumer can check is the laser inscription on the diamond’s girdle.

Many diamonds accompanied by a laboratory report have a microscopic inscription on the edge of the stone corresponding to the report number.

If your diamond has a report, a jeweller or gemmologist can use magnification to examine the girdle and compare the inscription with the report.

However, consumers should understand that an inscription alone is not proof of a diamond’s identity. It needs to correspond with the actual laboratory report and the characteristics of the stone.

If there is no report, an inscription by itself provides very limited protection.

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Why an Independent Diamond Laboratory Report Matters

This is where an independent gemmological laboratory becomes extremely important.

A professional laboratory can examine the diamond using sophisticated equipment and gemmological techniques that go far beyond a basic handheld tester.

Depending on the laboratory and the examination required, testing may assess characteristics such as:

• Natural or laboratory-grown origin
• Diamond quality
• Colour
• Clarity
• Cut and proportions
• Fluorescence
• Inclusions
• Treatments
• Growth characteristics
• Other identifying features

The result is an independent report that documents the characteristics of the stone.

This creates something extremely valuable for the consumer:

A documented identity for your diamond.

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Why This Protects You When Buying a Diamond

Imagine purchasing a diamond ring today for a significant amount of money.

The salesperson tells you that the centre stone is a natural diamond.

You take the ring home, but there is no independent laboratory report.

Years later, you decide to sell, upgrade or insure the ring.

How do you prove what the diamond actually is?

This is where problems can arise.

Without independent documentation, you may be relying on:

• The original seller’s description
• An old invoice
• A valuation
• Your own understanding of the stone
• A basic diamond tester
• A verbal representation of the diamond’s origin

None of these provides the same level of independent evidence as a recognised laboratory report.

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A Valuation Is Not the Same as a Diamond Grading Report

This distinction is often misunderstood.

A valuation primarily addresses the monetary value of an item for a particular purpose, such as insurance or estate planning.

A diamond grading report documents the gemmological characteristics of the diamond.

These are different services.

For example, a valuation might state that a ring has an estimated replacement value of a particular amount. It does not necessarily establish, to the same level of gemmological certainty, whether the centre diamond is natural or laboratory-grown.

For consumers buying a significant diamond, having the diamond independently examined and documented can therefore be extremely important.

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Natural Diamond or Laboratory-Grown Diamond — Why the Difference Matters

There is nothing inherently wrong with choosing a laboratory-grown diamond.

For some consumers, a laboratory-grown diamond may provide the opportunity to purchase a larger or higher-specification diamond for a particular budget.

Others specifically want a natural diamond because of its geological origin, rarity, history and established place within the natural diamond market.

The important point is choice and transparency.

A customer should know exactly what they are buying and what they are paying for.

A laboratory-grown diamond should be represented as laboratory-grown.

A natural diamond should be represented as natural.

The consumer should never have to guess.

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What Should You Do Before Buying?

If you are purchasing a significant diamond, DCLA recommends asking a few straightforward questions:

1. Is the diamond natural or laboratory-grown?

Do not rely solely on verbal assurances.

2. Is there an independent laboratory report?

Ask to see the original report and check that it corresponds with the diamond.

3. Does the diamond have a report number inscription?

If so, have the inscription checked under magnification.

4. Does the report describe the actual diamond?

The report should correspond to the stone’s identifying characteristics.

5. If there is no report, can the diamond be independently examined?

For a valuable diamond, independent verification can provide significant peace of mind.

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What If You Already Own a Diamond Without a Report?

Don’t panic.

If you have an engagement ring, inherited diamond, family jewellery or a diamond purchased many years ago without documentation, it does not automatically mean there is a problem.

You can have the diamond examined by a suitably qualified gemmological laboratory.

Professional testing can help establish whether the stone is natural or laboratory-grown and document its characteristics.

This can be particularly valuable if you are considering:

• Selling the diamond
• Upgrading your jewellery
• Obtaining insurance
• Estate planning
• Dividing an inheritance
• Purchasing a replacement
• Establishing what you actually own

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The Bottom Line: Don’t Test the Diamond — Verify It

A basic diamond tester can be useful.

A loupe can be useful.

An experienced jeweller can be useful.

But none of these should be confused with a comprehensive independent laboratory examination.

A diamond tester can tell you that a stone behaves like diamond. It does not necessarily tell you whether that diamond came from the earth or was grown in a laboratory.

When the origin and quality of a diamond matter, independent laboratory testing and documentation provide the strongest form of consumer protection.

DCLA — Independent Diamond Expertise

The Diamond Certification Laboratory of Australia (DCLA) provides professional diamond and gemmological services designed to give consumers, jewellers, insurers and industry professionals greater confidence in the diamonds they buy, sell and own.

Whether you are purchasing a new diamond, checking an existing engagement ring or looking to understand the characteristics and origin of a family diamond, independent examination can give you something a simple tester cannot:

documented confidence in what your diamond actually is.

When it comes to a significant diamond purchase, don’t simply ask, “Does it test as a diamond?”

Ask the more important question:

“Can I independently verify exactly what this diamond is?”

The Future of Natural Diamonds: As Global Mines Reach End of Life, Will the Second-Hand Market Become the New Source of Supply?

 

For more than 150 years, the world’s natural diamond industry has relied on a steady pipeline of newly mined diamonds entering the market. However, that era is rapidly changing. Many of the world’s most productive diamond mines are approaching the end of their economic lives, exploration success has slowed dramatically, and few major new discoveries are expected to replace the enormous production that is disappearing.

This raises an important question for the jewellery industry, collectors, and consumers alike:

Where will tomorrow’s natural diamonds come from?

The World’s Largest Diamond Mines Are Running Out

Many of the world’s iconic diamond mines are now in decline or nearing closure.

Examples include:

• Argyle Mine (Australia) – Closed in 2020 after producing more than 865 million carats over its 37-year life. Argyle supplied around 90% of the world’s rare pink diamonds and was once one of the highest-volume producers globally. Its closure permanently removed a significant source of natural diamonds from the market.
• Diavik Mine (Canada) – Scheduled to cease production around 2026–2027 after two decades of operation.
• Ekati Mine (Canada) – Although still operating, reserves continue to decline and production has fallen significantly from its peak.
• Venetia Open Pit (South Africa) – Transitioning to underground mining to extend its life, but at considerably lower production levels and substantially higher operating costs.
• Jwaneng (Botswana) – Often described as the richest diamond mine in the world, it continues to produce exceptional diamonds, although maintaining production requires increasingly expensive underground expansion projects.
• Orapa (Botswana) – One of the world’s largest diamond mines by area, but also a mature operation facing the realities of ageing reserves.

Few major discoveries have emerged over the past twenty years that are capable of replacing the millions of carats these operations once produced.

New Discoveries Are Becoming Increasingly Rare

Diamond exploration is an expensive, high-risk undertaking.

Unlike previous decades, when rich kimberlite pipes were discovered in Australia, Canada, Russia and southern Africa, today’s exploration companies face:

• Much deeper geological targets
• Increasing environmental approvals
• Higher capital costs
• Greater political uncertainty
• Reduced investor appetite

Even when a new deposit is found, bringing it into commercial production can take well over a decade and require investments measured in billions of dollars.

The result is a steadily shrinking pipeline of new natural diamonds.

Fewer Diamonds Does Not Mean Lower Demand

Although consumer preferences continue to evolve, natural diamonds remain highly sought after for fine jewellery, investment-grade stones and rare collector pieces.

Unlike laboratory-grown diamonds, every natural diamond is a finite geological resource formed between one and three billion years ago. Once mined, no new natural diamonds can be manufactured.

As mining output declines, the existing inventory of polished natural diamonds becomes increasingly important.

The Rise of the Secondary Market

Historically, relatively few diamonds returned to the market.

Natural diamonds were commonly passed through generations as family heirlooms or remained in jewellery collections for decades.

However, several factors are beginning to change this:

• An ageing population transferring wealth
• Estate jewellery entering the market
• Increased recycling by professional jewellers
• Specialist diamond buying companies
• Greater consumer awareness of resale value
• Online marketplaces making resale easier

Over time, previously owned natural diamonds may become one of the largest sources of supply for the jewellery trade.

Much like antique watches, rare coins and fine art, existing natural diamonds may circulate repeatedly between owners while no meaningful replacement supply enters the market.

Recycling Diamonds Is Not New

The diamond trade has quietly recycled diamonds for centuries.

Antique European jewellery has often been dismantled and remounted multiple times as fashions changed.

Victorian diamonds became Edwardian jewellery.

Edwardian diamonds became Art Deco pieces.

Art Deco diamonds have been reset into modern engagement rings.

The diamond itself may have changed settings numerous times while remaining the same natural gemstone throughout its life.

This process is likely to accelerate as newly mined diamonds become increasingly scarce.

Authentication Will Become More Important Than Ever

As more diamonds enter the secondary market, authentication will become increasingly critical.

Consumers will want certainty that the diamond they are purchasing is:

• Natural rather than laboratory-grown
• Correctly identified
• Accurately graded
• Free from undisclosed treatments
• Properly documented

This places greater importance on independent laboratory grading.

Professional laboratories such as DCLA play an essential role in verifying the identity and quality of diamonds entering both the primary and secondary markets. Independent examination provides confidence for buyers, sellers, insurers and future owners alike.

The Growing Challenge of Laboratory-Grown Substitution

One emerging concern is the increasing number of natural diamond certificates being fraudulently paired with laboratory-grown diamonds or simulants.

As DCLA has previously reported, certificates can be separated from the original stone, creating opportunities for deliberate substitution. As secondary market activity increases, verifying that the diamond matches its accompanying grading report will become essential.

Independent examination helps protect both consumers and the integrity of the natural diamond market.

A Market That Could Resemble Fine Art

Natural diamonds possess one characteristic that laboratory-grown diamonds can never replicate—true geological scarcity.

As mine production continues to decline, natural diamonds may increasingly resemble other finite luxury assets such as fine art, vintage automobiles and rare watches.

Their value will not simply depend on beauty or craftsmanship, but also on rarity, provenance and authenticated identity.

The second-hand market is therefore likely to evolve from an occasional source of supply into a fundamental pillar of the global natural diamond industry.

Looking Ahead

The natural diamond industry is entering a period of structural change.

Mine production is expected to continue declining over the coming decades, while new discoveries remain scarce and increasingly difficult to develop. Existing polished diamonds already in private ownership represent an enormous reservoir of future supply.

As these stones gradually re-enter the marketplace through resale, estate collections and jewellery recycling, confidence in independent authentication will become more important than ever.

For laboratories such as DCLA, this evolving landscape reinforces a central responsibility: ensuring every diamond can be accurately identified, independently graded and matched to its rightful documentation. In a future where existing natural diamonds become an increasingly valuable and finite resource, trust will be as important as the diamonds themselves.

Disclaimer: This article is intended for general industry information and commentary. Market conditions, mine production and future supply forecasts are subject to change. DCLA encourages consumers and members of the jewellery trade to obtain independent laboratory verification when buying, selling or re-entering natural diamonds into the marketplace.

Nature vs Technology: Why Large Natural Diamonds Are Exceptionally Rare While Large Laboratory-Grown Diamonds Are Increasingly Common

 

For billions of years, nature has been producing diamonds deep beneath the Earth’s surface under immense pressure and temperatures exceeding 1,000°C. Every natural diamond is the result of a geological journey unlike any other gemstone, carrying with it a unique record of the Earth’s history.

Today, laboratory-grown diamonds are manufactured in controlled environments over a period of weeks rather than billions of years. While they possess the same crystal structure as diamond, the economics of their production are almost the complete inverse of nature.

Nature’s Ratio: Large Diamonds Are Exceptionally Rare

Natural diamond deposits follow a remarkably predictable size distribution.

The overwhelming majority of diamonds recovered from mines around the world are small crystals. As crystal size increases, rarity increases exponentially. Large gem-quality rough diamonds are exceptionally uncommon because their growth requires an uninterrupted geological environment over immense periods of time. Even minor changes in pressure, temperature, or surrounding chemistry can halt growth or fracture a developing crystal.

This means that:

• Small diamonds make up the vast majority of natural production.
• Medium-sized diamonds are considerably less common.
• Large diamonds are exceptionally rare.
• Very large, high-quality diamonds are among the rarest natural materials on Earth.

This natural scarcity is why diamonds above several carats increase dramatically in value. Their rarity is not created by marketing—it is governed by geology.

Laboratory Production: The Reverse Distribution

Laboratory-grown diamonds operate under a completely different economic model.

Manufacturers begin with a tiny diamond seed and grow additional carbon onto it using either High Pressure High Temperature (HPHT) or Chemical Vapour Deposition (CVD) technology.

Unlike mining, where large diamonds are rarely discovered, laboratory production often aims to grow the largest crystal economically possible.

The production costs of a laboratory-grown diamond are concentrated in operating the equipment rather than discovering the crystal. Once a growth cycle has begun, extending growth to produce a larger crystal is frequently more profitable than manufacturing numerous small stones.

As a result:

• Larger laboratory-grown rough is increasingly common.
• Multiple large diamonds can be produced from a single manufacturing facility every month.
• Production volumes are limited primarily by equipment capacity and electricity costs rather than geological rarity.

In many modern factories, larger diamonds are actually preferred because they provide greater manufacturing flexibility and can be cut into multiple finished stones.

The distribution therefore becomes almost the reverse of nature.

Billions of Years vs Several Weeks

Natural diamonds typically formed between one and three billion years ago within the Earth’s mantle at depths approaching 150 to 250 kilometres.

Their growth occurred slowly under constantly changing geological conditions before volcanic eruptions transported them to the Earth’s surface through kimberlite and lamproite pipes.

Laboratory-grown diamonds, by comparison, are produced in controlled chambers over several weeks.

Every variable—including temperature, pressure, gas composition and growth rate—is carefully managed by technicians rather than nature.

A Record of Earth’s History

One of the most fascinating differences lies within the crystal itself.

Natural diamonds contain microscopic traces of the environment in which they formed. These include tiny amounts of nitrogen, boron, hydrogen and numerous other trace elements that became incorporated into the crystal lattice over geological time.

Many natural diamonds also contain microscopic mineral inclusions originating from deep within the Earth’s mantle. These tiny crystals provide scientists with valuable information about regions of the Earth that can never be directly sampled.

In effect, every natural diamond is a geological time capsule.

Laboratory-grown diamonds, however, are produced from highly purified carbon sources under carefully controlled conditions. Their objective is consistency rather than geological complexity.

Consequently, laboratory-grown diamonds are composed almost entirely of carbon, with very low levels of naturally occurring trace elements. Depending on the manufacturing process, they may instead exhibit characteristics associated with their production, including metallic catalyst residues in some HPHT-grown diamonds or growth-related structural features in CVD-grown diamonds.

Rather than recording billions of years of Earth’s geological history, laboratory-grown diamonds primarily reflect the manufacturing process used to create them.

Why These Differences Matter

Although natural and laboratory-grown diamonds share the same fundamental crystal structure and hardness, their origin is entirely different.

Natural diamonds represent an irreplaceable finite resource created by geological processes that cannot be replicated by nature within any human timescale. Their rarity is determined by billions of years of Earth history and the extremely low probability of large crystal formation.

Laboratory-grown diamonds represent an impressive technological achievement. They are manufactured products whose supply is governed by industrial capacity, advances in production technology and manufacturing costs.

Understanding these differences is essential when assessing rarity, long-term availability and market value. As laboratory production continues to expand, large laboratory-grown diamonds are expected to become increasingly accessible, while large natural diamonds will remain among the rarest and most sought-after treasures ever created by nature.

The DCLA Perspective

At the Diamond Certification Laboratory of Australia (DCLA), every diamond is identified and graded according to internationally recognised gemmological standards. Whether natural or laboratory-grown, accurate identification allows consumers, jewellers and collectors to make informed decisions based on origin, rarity and value.

While both categories have their place within today’s jewellery market, they should never be considered equivalent in terms of geological origin. One is a remarkable product of Earth’s natural history, while the other is a remarkable achievement of modern science.

Understanding that distinction remains fundamental to informed purchasing and responsible disclosure throughout the diamond industry.

Source: DCLA

Natural Diamonds Face a Defining Period of Change and Opportunity

 

The natural diamond industry is entering a crucial period of transformation, with market leaders highlighting the key forces that will shape demand, supply and consumer confidence over the next five years.

According to analysis from De Beers, rebuilding demand for natural diamonds will depend on several important industry priorities, including stronger marketing, clearer differentiation from lab grown diamonds and a more balanced supply environment.

Marketing Remains Critical for Natural Diamond Demand

De Beers believes effective marketing will play a central role in restoring consumer desire for natural diamonds. After a period of changing consumer behaviour and economic uncertainty, the industry must continue to communicate the unique emotional value, rarity and enduring legacy of natural diamonds.

Building a stronger connection with younger consumers will be essential to ensuring natural diamonds maintain their position as symbols of love, commitment and achievement.

Lab Grown Diamond Pricing Faces Growing Pressure

The rapid growth of synthetic lab grown diamonds has created a new competitive landscape for the diamond industry.

However, current retail margins on lab grown diamonds are expected to face increasing pressure as competition expands and production continues to rise. As prices decline, the industry believes consumers will increasingly focus on understanding the differences between natural diamonds and laboratory created alternatives.

Differentiation Becomes Key to Consumer Confidence

Clear education and transparency will be vital for the future of the diamond market.

Natural diamonds are formed over billions of years beneath the earth’s surface, while lab grown diamonds are created through technological processes in controlled environments. Ensuring consumers understand these differences will be important in maintaining confidence and value perception.

Independent grading and certification from recognised laboratories such as DCLA will continue to play an important role in providing consumers with trust and assurance when purchasing natural diamonds.

Declining Rough Diamond Supply Could Support Long Term Market Balance

Another major factor shaping the future of natural diamonds is declining global rough diamond production.

With several major mines reaching maturity and fewer large discoveries entering production, supply is expected to reduce over the medium to long term. A tighter supply environment could help support a healthier balance between availability and demand.

Russia Introduces New Rough Diamond Export Duty

Russia is set to introduce an 8% export duty on rough diamonds weighing 0.45 carats or more from September 1.

The new measure, announced through a government decree, adds another layer of complexity to the global rough diamond supply chain. Russia remains one of the world’s largest diamond producers, meaning changes to its export policies can influence international market dynamics.

AWDC Launches First Sale of Traceable Artisanal Diamonds from Congo

The Antwerp World Diamond Centre has completed its first sale of artisanally mined rough diamonds from the Democratic Republic of Congo through the OrigemA programme.

Established in 2022 as a partnership between Belgium and the DRC, OrigemA aims to connect small scale Congolese miners with international markets by providing fully traceable artisanal diamonds.

The programme is designed to improve market access for artisanal miners while ensuring they receive fair value for their production. The DRC accounts for a significant share of global artisanal diamond output, making responsible sourcing initiatives increasingly important for the future of the industry.

Petra Diamonds Faces Ongoing Industry Pressure

Petra Diamonds continues to experience the challenges affecting many mid tier diamond producers as the industry works through a prolonged period of market disruption.

Lower rough diamond prices, weaker luxury demand in key markets and increased competition from lab grown diamonds have created financial pressure across the sector.

The company’s restructuring challenges highlight the broader issues facing producers with concentrated operations and single commodity exposure. The coming years are expected to test the resilience of diamond miners as the industry adjusts to changing consumer demand and evolving market conditions.

The Future of Natural Diamonds

The next five years will be a defining period for the natural diamond industry.

Success will depend on strengthening consumer confidence, improving education, supporting responsible sourcing and reinforcing the unique value of natural diamonds.

While the market faces significant challenges, declining supply, stronger differentiation and renewed storytelling around natural diamonds could create the foundation for a more balanced and sustainable future.

Source: DCLA