Best Place to Buy Diamonds in Australia: Knowledge, Experience and Confidence

 

Buying a diamond is one of the most important jewellery purchases many people will ever make. Yet with thousands of diamonds available online and through jewellery stores, knowing where to buy a diamond, and who to trust, can be difficult.

Price, appearance and marketing can all influence a purchase, but there is another factor that should never be overlooked: knowledge.

At the Diamond Certification Laboratory of Australia (DCLA), decades of experience in the diamond industry have created a unique depth of knowledge, from rough diamond mining and trading, through to cutting, polishing, grading and certification.

That experience provides something a price tag alone cannot: confidence that you understand what you are buying.

Why experience matters when buying a diamond

It is easy to look at the famous 4Cs, carat, colour, clarity and cut and assume that buying a diamond is simply a matter of comparing numbers.

It isn’t.

Two diamonds with apparently similar specifications can look very different and can have significantly different values. Small variations in colour, clarity, proportions, fluorescence, transparency and cut can influence both appearance and price. DCLA notes that even small changes in the characteristics of a diamond can have a substantial effect on value.

This is where real diamond experience matters.

Someone who has spent decades examining diamonds doesn’t simply read a certificate. They understand how a diamond behaves, how it was cut, how its proportions affect light performance and how the individual characteristics of the stone influence its desirability.

From the mine to the polished diamond

The DCLA story is unusual because its expertise extends far beyond laboratory grading.

The Cohen family’s involvement in the diamond industry stretches back to Johannesburg in the 1970s. Bruce Cohen began his diamond career under the guidance of his father, David Cohen. Michael Cohen trained as a polisher, cleaver and marker with a major De Beers sightholder before establishing diamond offices and cutting operations in southern Africa. Roy Cohen subsequently became involved in rough diamond trading and mining interests.

That means the knowledge behind DCLA has been developed across virtually every stage of a diamond’s journey.

Rough diamond.
Mining.
Trading.
Planning.
Cleaving.
Polishing.
Grading.
Certification.
Buying and selling.

This provides a perspective that is difficult to replicate.

The advantage of buying with an independent laboratory behind you

One of the most important questions a diamond buyer should ask is:

Who graded the diamond?

A grading report should come from an independent laboratory rather than simply being an in-house document produced by the person selling the diamond.

DCLA specifically warns consumers to be cautious about reports produced by retailers or merchants who have a financial interest in the stone. Independent grading provides an additional layer of confidence because the laboratory is assessing the diamond rather than selling it.

DCLA is an internationally accredited diamond grading laboratory in Australia, with grading conducted in Sydney by qualified gemmologists according to IDC and CIBJO standards.

Don’t just buy the certificate, understand the diamond

Buying a diamond is one of the most important jewellery purchases

A certificate is important, but the real value comes from understanding what the certificate means.

A DCLA Diamond Grading Report records characteristics including:

• Carat weight
• Colour
• Clarity
• Cut
• Symmetry and polish
• Measurements and proportions
• Fluorescence
• Transparency
• Whether the diamond is natural or laboratory-grown
• Treatments or enhancements
• Unique identifying information

But experienced diamond professionals can take that information further.

They can help explain why one diamond may offer better visual performance than another, whether you are paying for characteristics that you can actually see, and where your money may be better spent.

The best diamond isn’t necessarily the most expensive

One of the biggest mistakes a buyer can make is believing that the highest grades automatically represent the best purchase.

The objective should be to find the right diamond for your budget and your priorities.

Perhaps you want maximum size.

Perhaps brilliance is your priority.

Perhaps you want exceptional colour.

Perhaps you want a diamond with a particular shape.

Or perhaps you want to maximise beauty while avoiding paying a premium for characteristics that make little visible difference to the eye.

This is where independent advice can make a significant difference.

Rather than simply selling you a diamond, the objective should be to help you understand why one diamond represents a better choice than another.

Buying online versus buying from an expert

Online diamond retailers can offer enormous choice and make it easy to compare prices.

But a photograph and a list of specifications cannot always tell the whole story.

A diamond is a three-dimensional optical object. Its proportions, facet arrangement, inclusions and light performance all contribute to how it looks in real life.

For a significant purchase, having access to someone who can explain the diamond in understandable terms can be invaluable.

And for buyers who want the ultimate level of confidence, an independent laboratory provides another important safeguard.

Australian consumer organisation CHOICE similarly recommends shopping around and obtaining an independent grading certificate for significant diamond purchases.

Confidence is more than a good price

The cheapest diamond is not necessarily the best diamond.

The best diamond is the one you understand, are confident in, and believe represents the right combination of beauty, quality and value for your circumstances.

This is why DCLA believes diamond buying should be an educational experience rather than simply a sales transaction.

With decades of experience extending from rough diamonds and polishing to modern scientific grading, DCLA brings together old-fashioned diamond knowledge and modern laboratory technology.

Every diamond certified by DCLA is examined in its Sydney laboratory, combining hands-on expertise with advanced instrumentation.

So, where is the best place to buy a diamond in Australia?

There are many places Australians can purchase diamonds, from online retailers and traditional jewellers to specialist diamond dealers.

But if you are looking for something more than a transaction, look for experience, independence, transparency and expertise.

That is what makes the DCLA approach different.

You are not simply buying a stone.

You are making a significant financial and emotional decision with the benefit of people who have spent decades working with diamonds at almost every level of the industry.

From the rough diamond to the finished gem, that experience matters.

And when you are spending thousands, or tens of thousands, of dollars on a diamond, having the right knowledge behind your decision can be worth far more than simply finding the lowest advertised price.

Buy with knowledge. Buy with confidence. Buy a diamond you understand.

Visit the Diamond Certification Laboratory of Australia

DCLA is an independent diamond grading and certification laboratory. A grading report describes the characteristics of a diamond and is not, by itself, a valuation or statement of market price.

Georgina Rodríguez Sparkles in More Than 250 Carats of Diamonds at Wedding to Cristiano Ronaldo

 

Georgina Rodríguez made a spectacular entrance at her intimate wedding to football superstar Cristiano Ronaldo, wearing an extraordinary collection of Chopard jewellery featuring more than 250 carats of diamonds.

The centrepiece of Rodríguez’s bridal jewellery was an exceptional necklace incorporating a 50 carat brilliant-cut diamond, alongside a 6.41-carat brilliant-cut diamond, approximately 98 carats of pear-shaped diamonds, 40 carats of brilliant-cut diamonds and 2 carats of marquise-cut diamonds.

Her earrings were equally impressive, featuring two 25 carat pear-shaped diamonds, complemented by 26 carats of heart-shaped diamonds and 4.35 carats of brilliant-cut diamonds.

Rodríguez completed the ensemble with two diamond rings one from Chopard’s renowned Garden of Kalahari collection and another from its Haute Joaillerie collection together with a diamond bracelet.

The extraordinary jewellery collection has been estimated by some reports to be worth up to US$55 million, although the true value of such exceptional pieces would depend on factors including diamond quality, provenance, design and craftsmanship.

Rodríguez, 32, married Portuguese football star Cristiano Ronaldo, 41, in a private civil ceremony in Cascais, Portugal, on 11 August 2026. The intimate celebration was attended by the couple’s five children.

Ronaldo marked the occasion on social media with a photograph of the couple’s hands displaying their wedding bands, accompanied by the simple caption: “CG”.

The wedding took place exactly one year after Rodríguez announced their engagement on 11 August 2025, when she revealed her spectacular oval-shaped engagement ring.

A Showcase of Exceptional Diamond Jewellery

From a diamond perspective, Rodríguez’s bridal jewellery demonstrates the extraordinary scale and diversity that can be achieved in high jewellery. The combination of large centre stones with pear, heart, marquise and brilliant cuts creates a dramatic display while highlighting the importance of precision cutting and craftsmanship.

Pieces featuring diamonds of this magnitude are exceptionally rare. Beyond carat weight, their value is influenced by the 4Cs colour, clarity, cut and carat weight as well as rarity, provenance and the reputation of the jewellery house.

For the diamond industry, celebrity jewellery such as this provides a fascinating insight into the upper end of the international luxury diamond market, where exceptional stones can become as much works of art and symbols of rarity as they are jewellery.

DCLA, Diamond Certification Laboratory of Australia
Independent diamond expertise, grading and education.

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?”

Could Diamonds Follow the Pearl Industry? Lessons from One of Jewellery's Greatest Transformations

 

For more than a century, natural diamonds have represented rarity, permanence and prestige. Yet today, the diamond industry is experiencing one of the most significant periods of change in its history. The rapid rise of laboratory-grown diamonds has challenged long-held assumptions about rarity, value and production.

While many compare laboratory-grown diamonds to synthetic gemstones, perhaps a more relevant comparison lies elsewhere. The transformation of the pearl industry offers an intriguing historical precedent.

Could diamonds be following a similar path?

When Nature Could No Longer Meet Demand

Before the early twentieth century, every pearl was natural.

Finding a single fine pearl required divers to open thousands of wild oysters, making exceptional pearls extraordinarily rare and valuable. As demand increased, natural oyster beds became depleted through over-harvesting, pollution and environmental change. The jewellery market faced an obvious problem: consumers wanted pearls, but nature simply could not supply them in sufficient quantity.

The solution came through cultured pearls.

By introducing a tiny nucleus into a living oyster, pearl farmers could encourage the oyster to produce a genuine pearl under controlled conditions. The process still relied on nature, but it dramatically increased consistency, availability and affordability.

Initially, cultured pearls were met with scepticism. Many believed they would destroy the value of natural pearls.

Instead, something quite different happened.

Two Markets Emerged

Rather than replacing natural pearls entirely, cultured pearls created an entirely new market.

Millions of consumers who had never been able to afford fine pearls suddenly could.

Natural pearls, however, became even rarer. As natural harvesting declined, truly exceptional natural pearls became increasingly desirable to collectors, museums and high-end jewellery houses.

Today, important natural pearl necklaces regularly achieve extraordinary auction results because of their rarity and historical significance.

The market effectively separated into two distinct categories:

• Cultured pearls became the mainstream jewellery product.
• Natural pearls became exceptional collector’s items.

Both markets survived—but they served different customers.

Diamonds May Be Facing a Similar Evolution

Laboratory-grown diamonds are not imitation diamonds.

They possess the same crystal structure, chemical composition and optical properties as natural diamonds. Modern technology can produce exceptionally high-quality stones in a matter of weeks rather than over billions of years beneath the Earth’s surface.

Production efficiencies continue to improve.

Prices have fallen dramatically.

Quality has become increasingly consistent.

For many jewellery buyers, laboratory-grown diamonds offer larger sizes and higher specifications at significantly lower prices than natural diamonds.

This has fundamentally changed the entry-level diamond jewellery market.

The Difference is Rarity

Where the comparison becomes interesting is the concept of rarity.

Natural diamonds are finite geological creations formed over billions of years under immense heat and pressure.

Laboratory-grown diamonds can be manufactured repeatedly whenever production facilities are expanded.

This distinction mirrors the difference between natural and cultured pearls.

One derives its rarity from nature.

The other derives its availability from technology.

Neither is inherently “better” in every situation they simply satisfy different consumer priorities.

Luxury Has Always Valued Scarcity

History shows that luxury markets rarely disappear simply because a more affordable alternative becomes available.

Mechanical watches continue to thrive despite the accuracy of digital watches.

Original artworks remain valuable despite the existence of perfect reproductions.

Vintage wines command remarkable prices despite modern winemaking techniques.

Natural pearls retained their prestige after cultured pearls became mainstream.

Collectors often place a premium on objects that cannot simply be reproduced.

The same principle may continue to apply to exceptional natural diamonds.

Large, rare coloured diamonds, historically significant gemstones and stones with remarkable provenance are unlikely to lose their appeal simply because laboratory-grown diamonds become increasingly common.

Will Natural Diamonds Become More Exclusive?

As mining becomes more challenging and fewer new diamond deposits are discovered, the supply of natural diamonds may gradually tighten.

Several major mines are approaching the end of their productive lives, while fewer world-class discoveries have been made over the past two decades.

If production continues to decline while the finest stones remain desirable, natural diamonds could increasingly occupy a position similar to that of natural pearls—less common, more exclusive and primarily sought by collectors and connoisseurs.

Rather than competing directly with laboratory-grown diamonds, they may simply occupy a different market.

What Happens to Everyday Diamond Jewellery?

This may be where laboratory-grown diamonds reshape the industry most dramatically.

Consumers purchasing jewellery primarily for its appearance, design or sentimental value may increasingly choose laboratory-grown diamonds because they provide greater size and quality within a given budget.

Jewellery designers gain greater creative freedom.

Consumers gain more choice.

The overall market for diamond jewellery could even expand as affordability improves.

This is remarkably similar to what occurred with cultured pearls, which transformed pearls from an occasional luxury into an everyday jewellery category.

The Importance of Transparency

One lesson from the pearl industry is particularly relevant.

Consumers accepted cultured pearls because the industry clearly distinguished them from natural pearls.

Each category developed its own identity.

The same principle is essential for diamonds.

Natural and laboratory-grown diamonds are both genuine diamonds, but they have different origins, different rarity profiles and different market dynamics.

Clear disclosure, accurate grading and transparent terminology allow consumers to make informed purchasing decisions based on their own priorities rather than confusion or marketing.

The Future May Not Be Either-Or

The history of jewellery suggests that technological innovation rarely eliminates natural luxury products.

Instead, it often creates broader markets with distinct categories serving different needs.

Natural pearls and cultured pearls now coexist successfully.

It is entirely possible that natural and laboratory-grown diamonds will do the same.

Natural diamonds may increasingly represent geological rarity, heritage and long-term collectability.

Laboratory-grown diamonds may continue to dominate fashion jewellery, bridal markets and value-conscious consumers seeking exceptional visual beauty.

Rather than one replacing the other, both could become permanent parts of the modern jewellery landscape.

Conclusion

The transformation of the pearl industry demonstrates that innovation does not necessarily diminish the value of natural treasures. Instead, it can redefine their place within the luxury market.

Whether diamonds ultimately follow the same path remains to be seen, but the parallels are compelling. Laboratory-grown diamonds have undoubtedly changed accessibility and affordability, much as cultured pearls did generations ago.

History suggests that when technology makes luxury more accessible, the rarest natural examples often become even more distinctive.

For the jewellery industry, the future may not be about choosing between natural and laboratory-grown diamonds. Instead, it may be about recognising that each serves a different purpose, a different customer and a different definition of value.

As with pearls, the industry may simply be witnessing the emergence of two complementary markets one built on the rarity of nature, the other on the possibilities of technology.

Source: DCLA