What Are Lab-Grown Diamonds?

A lab-grown diamond begins with a small diamond seed. Carbon atoms are then encouraged to form around that seed under carefully controlled conditions. As the process continues, the carbon develops into a diamond crystal that can be cut and polished for use in jewellery.

You may encounter several terms while shopping:

• Laboratory-grown diamond
• Lab-grown diamond
• Laboratory-created diamond
• Lab-created diamond
• Synthetic diamond

These terms describe a diamond with a manufactured rather than natural origin. They should not be confused with "diamond-look" stones.

The word "synthetic" can sound as though the stone is an imitation, but in gemmological terminology it refers to a material created through manufacturing that has substantially the same chemical composition and crystal structure as its naturally occurring counterpart.

UK advertising guidance requires retailers to make the laboratory-grown origin clear and not describe these stones simply as "diamonds" in a way that could cause buyers to believe they are naturally formed.

The two principal growth methods are High Pressure High Temperature and Chemical Vapour Deposition.

HPHT: High Pressure High Temperature

The HPHT process exposes a diamond seed and carbon source to very high pressure and temperature. These conditions allow carbon to crystallise around the seed and gradually develop into diamond material.

HPHT technology is designed to reproduce some of the conditions involved in natural diamond formation, but it does so inside specialised equipment rather than beneath the Earth's surface.

CVD: Chemical Vapour Deposition

In the CVD process, a thin diamond seed is placed inside a controlled chamber. A carbon-containing gas is introduced and energised. Carbon atoms separate from the gas and accumulate on the seed in successive layers.

The diamond crystal grows over multiple stages until it is large enough to be removed, assessed, cut and polished.

Neither growth method automatically guarantees a better finished diamond. The appearance of the final stone depends on its individual characteristics, cutting and any disclosed post-growth treatment.

For most jewellery buyers, the finished diamond's appearance, documentation and suitability for the design are more important than choosing purely between CVD and HPHT. The GIA publishes a technical explanation of both growth processes and how laboratory-grown diamonds are identified.

Lab-grown and natural diamonds differ in origin, formation time, growth environment, rarity and market behaviour.

Natural diamonds form through geological processes beneath the Earth's surface. Laboratory-grown diamonds are manufactured under controlled conditions using specialised equipment.

Factor	Lab-grown diamond	Natural diamond
Origin	Controlled laboratory environment	Natural geological formation
Formation	Manufactured using HPHT or CVD	Formed underground
Availability	Can be produced repeatedly	Limited by natural supply
Identification	Laboratory testing can establish origin	Laboratory testing can establish origin
Typical price	Generally lower than a comparable natural diamond	Generally higher
Resale market	Often limited and subject to changing prices	More established, although resale value is never guaranteed
Main attraction	Diamond material at a more accessible purchase price	Natural origin and geological rarity

This page only provides a summary. Read the dedicated comparison before deciding between the two.

Lab-grown diamonds should not be described as mined or natural diamonds, but they are also not diamond imitations such as cubic zirconia.

The important distinction is between origin and material:

• A lab-grown diamond has a laboratory origin and consists of diamond material.
• A natural diamond has a geological origin and consists of diamond material.
• Cubic zirconia and moissanite are different materials that may be used as diamond alternatives.

Specialised testing can establish whether a diamond formed naturally or was produced through HPHT or CVD growth. Visual appearance alone may not be enough to determine origin reliably.

No. A laboratory origin does not mean every diamond has the same appearance or quality.

Cut

Cut influences how effectively a faceted diamond reflects light. A well-proportioned diamond can appear brighter and more lively than a poorly cut diamond of a larger carat weight.

Colour

Diamonds may display different degrees of colour. The difference between nearby grades may be difficult to notice once the diamond is set, particularly in smaller earrings.

Clarity

Clarity considers internal and external characteristics. Many characteristics are difficult to see without magnification and may have little effect on how an earring appears during normal wear.

Carat weight

Carat measures diamond weight, not visual dimensions. Two diamonds with the same carat weight can appear different in size depending on their shape and proportions.

Shape

Round, oval, pear, emerald, princess and other shapes distribute their weight differently and create different visual effects.

Treatment and documentation

Some laboratory-grown diamonds receive post-growth treatment to alter their colour or appearance. Any relevant treatment and laboratory-grown origin should be disclosed by the retailer or assessment documentation.

For earrings, customers should also check whether a stated carat weight applies to each diamond or to the total pair.

Diamond is rated 10 on the Mohs scale of mineral hardness, meaning it is exceptionally resistant to scratching. Laboratory-grown diamonds share this characteristic because they consist of diamond material.

Hardness does not mean indestructibility. A diamond can still chip if struck strongly at a vulnerable point. Jewellery can also be damaged through:

• Loose or bent settings
• Broken posts or clasps
• Worn plating
• Harsh chemical exposure
• Impact during exercise or manual work
• Incorrect storage
• Contact with other jewellery

The durability of a finished piece therefore depends on the complete construction—not only the stone.

If jewellery is intended for regular wear, examine the setting, closure, metal, weight and care requirements as carefully as the diamond.

Laboratory-grown diamonds do not permanently lose their diamond properties through normal wear. However, oils, cosmetics, soap, dust and hair products can accumulate on the stone and reduce the amount of light reaching it.

Earrings are especially likely to collect residue because they sit close to the face, hair and skin.

Gentle cleaning can restore their appearance, but the method must also be suitable for the metal and finish. Gold-plated sterling silver should not be scrubbed aggressively or exposed to harsh cleaning chemicals.

Lab-grown diamonds avoid the physical extraction involved in diamond mining, but that fact alone does not prove that every laboratory-grown diamond has a lower environmental impact.

Production requires equipment and energy. Environmental performance can vary depending on:

• Energy source
• Production efficiency
• Factory location
• Growth method
• Cutting and polishing
• Metal sourcing
• Transportation
• Packaging
• Product lifespan

Terms such as "sustainable", "eco-friendly" or "carbon neutral" should only be used when a business has reliable evidence supporting the specific claim. The UK Advertising Standards Authority advises businesses to disclose laboratory-grown origin clearly and to substantiate environmental claims.

The strongest transparent description is that laboratory-grown diamonds have a different production route from mined diamonds. Buyers should consider the complete supply chain rather than assuming that origin alone answers every environmental question.

Yes. Laboratory-grown diamonds can be used in many of the same jewellery styles as natural diamonds, including stud earrings, huggie earrings, hoops, drop earrings, necklaces, bracelets, rings, ear stacks and occasion jewellery.

The most suitable design depends on how and where the jewellery will be worn.

Jewellery style	Suitable for	What to check
Diamond studs	Work, everyday wear and gifting	Size, post length, setting and total carat weight
Huggie earrings	Ear stacks and compact everyday styling	Internal diameter, closure and weight
Diamond hoops	Everyday statement and evening outfits	Diameter, weight and clasp
Drop earrings	Weddings, parties and formal events	Length, movement and comfort
Necklaces	Everyday styling and gifting	Chain length, clasp and pendant dimensions
Bracelets	Layering and occasion wear	Wrist size, clasp security and flexibility

Check the complete piece rather than looking only at the word "diamond".

Confirm the diamond's origin

The product description should clearly identify the stone as laboratory-grown. It should not use vague language that leaves the origin unclear.

Check the metal construction

Determine whether the jewellery is made from solid gold, sterling silver, gold-plated sterling silver, gold vermeil or another metal. These constructions have different prices, care requirements and long-term wear characteristics.

Check the actual dimensions

For earrings, look for diameter, drop length, post length, internal huggie diameter, product weight and individual or total carat weight.

Review the setting and closure

A beautiful stone still needs a suitable setting. Check whether the closure works for your routine and whether the design is likely to feel comfortable for the intended period of wear.

Understand the care requirements

Gold plating is a surface finish and may gradually wear depending on friction, moisture, chemicals and frequency of use. It is not permanent.

Choose for the intended use

A compact stud may be best for work and travel. A huggie can suit an ear stack. A drop earring may be preferable for weddings or evening events.

I Want Jewels uses laboratory-grown diamonds in jewellery designed for everyday styling, gifting and occasions. Pieces are created using 925 sterling silver with 14kt gold-plated finishes, subject to the specification of each individual product.

This provides a different proposition from solid-gold fine jewellery. Customers should choose based on the complete product construction, design, budget and care expectations.

Always review the individual product page for:

• Diamond details
• Metal construction
• Dimensions
• Closure
• Available colour finishes
• Care instructions
• Delivery and return information

Lab-grown diamonds are manufactured diamonds created through HPHT or CVD growth rather than natural geological formation. They are distinct from simulants such as moissanite and cubic zirconia, and their laboratory-grown origin should always be disclosed clearly.

For jewellery buyers, the decision should extend beyond whether a diamond was created in a laboratory. Look at the quality of the finished stone, the setting, metal construction, dimensions, closure, care requirements and how the piece will be worn.

If you are considering earrings, continue with the buying guide before comparing individual styles.