Lab-Grown Diamonds: The Complete Buying Guide

 

Lab-grown diamonds have transformed the diamond industry, giving couples another genuine option when choosing an engagement ring.

They offer the brilliance, hardness and appearance of a natural diamond, generally at a significantly lower price. This allows buyers to consider a larger diamond or higher colour and clarity grades without increasing their overall budget.

But are lab-grown diamonds real? How are they made, and how do they compare with natural diamonds?

This guide answers the most common questions about lab-grown diamonds to help you make an informed decision when choosing your next diamond engagement ring.

What Is a Lab-Grown Diamond?

A lab-grown diamond is a real diamond created in a controlled laboratory environment rather than formed naturally beneath the earth.

Lab-grown diamonds have essentially the same chemical composition, crystal structure and optical properties as natural diamonds. Both are made predominantly from crystallised carbon and display the brilliance, fire and durability associated with diamonds.

Lab-grown diamonds should not be confused with diamond alternatives such as cubic zirconia or moissanite. These are different materials with different chemical, physical and optical properties.

Lab-Grown vs Natural Diamonds: What Is the Difference?

The main difference between a lab-grown diamond and a natural diamond is its origin.

Natural diamonds formed deep within the earth over billions of years before being brought closer to the surface through geological activity. Lab-grown diamonds are produced over a much shorter period using technology that recreates the conditions required for diamond crystal growth.

To the unaided eye, a high-quality lab-grown diamond can appear identical to a comparable natural diamond. Both options are available in different shapes, carat weights, colours, clarities and cut qualities.

Feature	Lab-Grown Diamond	Natural Diamond
Composition	Crystallised carbon	Crystallised carbon
Appearance	Visually comparable to a natural diamond	Traditional natural diamond appearance
Formation	Created in a controlled laboratory	Formed naturally within the earth
Formation time	Generally weeks	Billions of years
Durability	10 on the Mohs hardness scale	10 on the Mohs hardness scale
Grading	Assessed using recognised diamond quality characteristics	Assessed using recognised diamond quality characteristics
Price	Generally significantly less expensive	Generally commands a higher price
Rarity	Can be produced using specialised technology	Limited by natural geological supply
Long-term value	Prices may change as production develops	Generally has a more established secondary market

Neither option is universally better. The right choice depends on your budget, priorities and how you feel about the diamond’s origin.

Are Lab-Grown Diamonds Real Diamonds?

Yes. Lab-grown diamonds are real diamonds.

They have essentially the same physical, chemical and optical properties as natural diamonds. They are also cut, polished and graded using many of the same quality considerations.

The term “lab-grown” describes how the diamond was created. It does not mean the stone is an imitation diamond.

How Are Lab-Grown Diamonds Made?

There are two primary methods used to grow diamonds:

• Chemical Vapour Deposition, known as CVD
• High Pressure High Temperature, known as HPHT

Both processes begin with a small diamond seed and create the conditions required for carbon atoms to develop into a diamond crystal.

Once the diamond has grown to the required size, it is cut and polished in much the same way as a natural rough diamond.

What Is a CVD Lab-Grown Diamond?

CVD stands for Chemical Vapour Deposition.

During the CVD process, a thin diamond seed is placed inside a sealed growth chamber. The chamber is filled with a carbon-containing gas and heated to very high temperatures.

Energy is used to break down the gas, allowing carbon atoms to settle onto the diamond seed. Over time, these carbon atoms build up in layers and form a larger diamond crystal.

The rough diamond is then removed from the chamber, assessed, cut and polished. Some CVD diamonds may also receive post-growth treatment to improve their colour.

What Is an HPHT Lab-Grown Diamond?

HPHT stands for High Pressure High Temperature.

This method uses specialised equipment to recreate some of the high-pressure and high-temperature conditions associated with natural diamond formation.

A diamond seed and carbon source are placed inside a growth cell. Under intense heat and pressure, the carbon dissolves and begins forming around the seed, gradually developing into a larger diamond crystal.

Once growth is complete, the rough diamond is cut and polished. HPHT technology may also be used as a post-growth treatment for some CVD diamonds.

Is CVD or HPHT Better?

Neither growth method is automatically better.

Beautiful, high-quality diamonds can be produced using either CVD or HPHT technology. The growth method alone does not determine how attractive the finished diamond will be.

More important factors include:

• Cut quality and proportions
• Light performance
• Colour
• Clarity
• Transparency
• Presence of visible inclusions
• Any post-growth treatment
• Overall visual appearance

Rather than choosing a diamond based solely on its growth method, assess the complete stone and its grading report.

Why Are Lab-Grown Diamonds So Popular?

Lab-grown diamonds have become popular because they offer buyers greater flexibility within their engagement ring budget.

Key reasons include:

Greater Size for Your Budget

Because lab-grown diamonds generally cost less than comparable natural diamonds, buyers may be able to select a larger carat weight without increasing their budget.

Higher Specifications

Some buyers choose to maintain their preferred carat weight and use the price difference to select a higher colour or clarity grade.

The Appearance and Durability of a Diamond

Lab-grown diamonds provide the brilliance, fire and hardness people expect from a diamond. They are suitable for engagement rings and other jewellery designed for regular wear.

Greater Choice

Lab-grown diamond technology has developed rapidly, creating a broad selection of shapes, sizes and specifications.

A Different Origin

Some clients prefer a diamond created in a controlled environment rather than one extracted from the earth. However, environmental and ethical impacts can vary between producers, energy sources and supply chains. Broad sustainability claims should therefore be considered carefully.

Are Lab-Grown Diamonds More Ethical or Sustainable?

Lab-grown diamonds are often marketed as a more ethical or environmentally friendly choice, but the answer is not always straightforward.

They avoid the mining process associated with natural diamonds, but growing diamonds requires substantial technology and energy. The environmental impact can vary depending on how the energy is generated and where the production facility operates.

Natural and lab-grown diamonds both have supply chains that should be considered. If environmental impact is important to you, ask for specific, verifiable information rather than relying on broad claims such as “eco-friendly” or “sustainable”.

Can You Tell the Difference Between Lab-Grown and Natural Diamonds?

Lab-grown and natural diamonds can look identical to the unaided eye. Even an experienced jeweller may not be able to confirm a diamond’s origin through visual inspection alone.

Many graded lab-grown diamonds have a microscopic inscription on the girdle that identifies the stone as laboratory grown and links it to its grading report. This inscription may be visible under magnification.

However, an inscription is not the only method of identification. Specialist gemmological laboratories use advanced instruments to examine growth patterns, fluorescence and spectroscopic features that distinguish lab-grown diamonds from natural diamonds.

A standard diamond tester generally cannot determine whether a diamond is natural or lab grown because both materials share the thermal and electrical characteristics of diamond.

Are Lab-Grown Diamonds Graded?

Yes. Lab-grown diamonds can be independently graded by recognised gemmological laboratories.

A laboratory report will generally document information such as:

• Laboratory-grown origin
• Diamond shape and measurements
• Carat weight
• Colour grade
• Clarity grade
• Cut grade, where applicable
• Polish and symmetry
• Fluorescence
• Growth method or post-growth treatment, where reported
• Grading report number

The report helps confirm the diamond’s laboratory-grown origin and provides an independent assessment of its quality characteristics. It is a grading report, not a financial valuation.

Do KAVALRI Lab-Grown Diamonds Have Grading Reports?

KAVALRI’s loose lab-grown diamonds above 0.50 carat are accompanied by an independent diamond grading report. Most are currently graded by the International Gemological Institute, known as IGI, while other recognised laboratories may also be represented.

IGI has extensive experience grading laboratory-grown diamonds. Its reports document the diamond’s origin and relevant quality characteristics, helping clients compare suitable options with confidence.

Always review the individual diamond listing and grading report to confirm the laboratory, specifications and any comments applicable to that stone.

How Much Do Lab-Grown Diamonds Cost?

Lab-grown diamonds generally cost significantly less than natural diamonds with comparable carat weight, shape and quality grades.

The exact difference can vary based on:

• Carat weight
• Diamond shape
• Cut quality
• Colour and clarity
• Growth method
• Supply and market conditions
• Individual stone quality

Rather than focusing only on the discount compared with a natural diamond, consider the quality and appearance of the individual lab-grown stone.

Prices for lab-grown diamonds have changed significantly as technology and production have developed. Buyers should be comfortable with the possibility that market prices may continue to change.

Do Lab-Grown Diamonds Hold Their Value?

Lab-grown diamonds should primarily be purchased to wear and enjoy, rather than as a financial investment.

Their resale market is less established than the market for natural diamonds, and advances in production have contributed to changing retail prices. A lab-grown diamond may therefore have limited resale or trade-in value.

Natural diamonds can also sell for substantially less than their original retail price, so neither option should be purchased with an expectation of guaranteed financial returns.

Do Lab-Grown Diamonds Become Cloudy?

A properly grown lab diamond does not become cloudy simply because it was created in a laboratory.

Like a natural diamond, it can appear dull when oils, moisturisers, soap and everyday residue collect on its surface. Regular cleaning and professional inspections will help maintain its appearance.

The diamond’s underlying quality does not deteriorate through normal wear.

Can Lab-Grown Diamonds Be Insured?

Lab-grown diamond rings can generally be insured, subject to the insurer’s terms and requirements.

Keep your purchase documentation, independent grading report and any valuation provided for insurance purposes. Because lab-grown diamond prices can change, ask your insurer how replacement value will be assessed if you need to make a claim.

Should I Choose a Lab-Grown or Natural Diamond?

Choose a lab-grown diamond if you:

• Want a larger-looking diamond within your budget
• Prefer higher specifications for the same spend
• Are comfortable with laboratory origin
• Are not purchasing primarily for rarity or resale value
• Want the appearance and durability of a diamond at a lower price

Choose a natural diamond if you:

• Value natural origin and geological rarity
• Prefer a diamond formed over billions of years
• Want a more established secondary market
• Feel a stronger emotional connection to a naturally formed stone
• Are comfortable allocating more of your budget to the centre diamond

At KAVALRI, we offer both natural and lab-grown diamonds. Our consultants will explain the advantages and considerations of each option without pushing you towards one particular choice.

Why Buy a Lab-Grown Diamond from KAVALRI?

KAVALRI provides access to an extensive selection of lab-grown diamonds through our transparent online diamond portal.

You can compare available stones using:

• High-definition diamond videos
• Independent grading reports
• Carat, colour, clarity and cut information
• Measurements and proportions
• Transparent pricing
• Expert guidance from our diamond consultants

Our team also assesses characteristics that may not be fully communicated by the 4Cs alone. These include proportions, transparency, inclusions and overall visual performance.

Once you have selected your diamond, it can be paired with one of our lab-grown diamond engagement ring designs or incorporated into a personalised ring.

Explore Lab-Grown Diamond Engagement Rings

Lab-grown diamonds provide an exciting option for buyers seeking exceptional size, brilliance and value.

The best choice is not simply the diamond with the highest specifications. It is the diamond that balances beauty, proportions, quality and price while complementing your chosen engagement ring design.

Explore KAVALRI’s lab-grown diamond engagement rings online or book an appointment with one of our experienced consultants for personalised assistance.

Frequently Asked Questions About Lab-Grown Diamonds

Are lab-grown diamonds fake?

No. Lab-grown diamonds are real diamonds. Cubic zirconia and moissanite are diamond alternatives, while lab-grown diamonds have essentially the same chemical, physical and optical properties as natural diamonds.

Can a lab-grown diamond scratch?

Lab-grown and natural diamonds are both extremely hard, but they are not indestructible. A diamond can chip if struck at a vulnerable angle, and another diamond can scratch it.

Do lab-grown diamonds sparkle like natural diamonds?

Yes. A well-cut lab-grown diamond can display the same brilliance and fire as a well-cut natural diamond. Cut quality has a major influence on sparkle.

Are lab-grown diamonds cheaper than natural diamonds?

Lab-grown diamonds generally cost significantly less than comparable natural diamonds, although prices vary according to the stone and current market conditions.

Can a diamond tester identify a lab-grown diamond?

A standard thermal diamond tester generally cannot distinguish a lab-grown diamond from a natural diamond. Advanced gemmological testing is required to confirm origin reliably.

Are lab-grown diamonds suitable for engagement rings?

Yes. Lab-grown diamonds have the hardness and durability required for an engagement ring and can be set in the same styles as natural diamonds.