Space Diamond vs Lab-Grown Diamond vs Natural Mined Diamond: The Science, Sparkle and Value Proposition

Natural diamond, laboratory-grown diamond and moissanite, what we call Space Diamond™, can all produce extraordinary jewellery. But scientifically, optically and financially, they are very different propositions.

A natural mined diamond is an extraordinary geological object: crystalline carbon formed within the Earth and ultimately recovered from a natural deposit.

A laboratory-grown diamond is also crystalline carbon, diamond created through advanced materials science rather than geological processes.

Moissanite can be viewed as a close structural analogue of diamond: instead of a tetrahedral lattice composed entirely of carbon atoms, silicon carbide consists of an extended tetrahedrally bonded network of alternating silicon and carbon atoms. Moissanite (Silicon carbide, SiC), is a remarkable crystalline material with exceptional hardness, a very high refractive index and substantially greater dispersion than diamond.

And its association with space is not a marketing invention.

Natural silicon carbide was famously identified by French chemist and later Nobel laureate Henri Moissan in material associated with the Canyon Diablo meteorite from Arizona. The mineral was subsequently named moissanite in his honour. Modern research has confirmed naturally occurring silicon carbide not only in meteorites, including material with extraterrestrial and even presolar origins, but also in exceptionally rare terrestrial geological environments.

That is why at Gemdrop® we use the name Space Diamond™.

Not because moissanite is diamond.

It isn't.

But because the extraordinary material we now grow in laboratories has a genuine geological and cosmochemical story that reaches far beyond the jewellery counter.

So which should you choose?

The answer depends on what you value.

The short answer: Space Diamond vs lab diamond vs natural mined diamond

If you want geological rarity and natural provenance, natural diamond offers something neither laboratory-grown material can reproduce: a crystal created by the Earth.

If you want diamond itself, but want substantially more size, colour and clarity for your budget, laboratory-grown diamond is an extraordinary proposition. It has essentially the same defining chemical, physical and optical properties as natural diamond because both materials are diamond.

If you want exceptional fire, outstanding durability and an entirely different high-performance crystal at a remarkably accessible price, Space Diamond™ moissanite deserves to be considered on its own merits.

There is no scientifically meaningful reason to declare one universally “better.”

They are different materials, and different forms of luxury.

What exactly is Space Diamond™?

Space Diamond™ is Gemdrop's name for premium laboratory-grown moissanite, crystalline silicon carbide with the chemical formula SiC.

The word moissanite itself has an extraordinary history.

Henri Moissan reported silicon carbide grains associated with the Canyon Diablo meteorite, which formed the famous Meteor Crater in Arizona. Academic literature records Moissan's meteorite discovery as the origin of the mineral's name, and subsequent research has established natural SiC in meteorites as well as extremely rare terrestrial settings.

There is an important distinction.

The moissanite used in modern jewellery is not normally extracted from meteorites.

Natural moissanite is extraordinarily rare, rarer on Earth than diamond, and commonly occurs as very small grains or crystals unsuitable for commercial jewellery production. Jewellery-quality moissanite is therefore grown using advanced crystal-growth technology.

So when Gemdrop® calls moissanite Space Diamond™, we are describing the remarkable scientific ancestry and optical role of the material, not claiming that the gem in your ring was cut from a meteorite or that moissanite is chemically diamond.

Scientifically, moissanite is its own material.

And that is exactly what makes it interesting.

Is moissanite really a “space” material?

Yes, with an important qualification.

Natural silicon carbide occurs in meteorites and extraterrestrial material, and some meteoritic SiC grains are extraordinarily ancient.

Some are presolar grains: material that formed around stars before our Solar System existed and was later incorporated into primitive extraterrestrial material.

But moissanite is not exclusively extraterrestrial.

Natural moissanite has also been documented in rare terrestrial environments including kimberlites, mantle-derived rocks and ophiolites. Research has investigated its occurrence alongside diamond-forming systems and under extraordinarily reducing geological conditions.

So the scientifically accurate description is:

Moissanite is a naturally occurring mineral with a genuine extraterrestrial history, first famously reported from meteoritic material, which can now be grown as jewellery-quality crystal in laboratories.

That story is considerably more interesting than simply calling it a “diamond substitute.”

Natural diamond: geology made visible

Natural diamond begins with carbon.

Under the appropriate conditions of pressure, temperature, chemistry and geological environment, carbon crystallises into the cubic structure we recognise as diamond.

The finished crystal can ultimately reach the Earth's surface through extraordinary geological processes before humans locate and recover it.

Every natural diamond therefore carries something laboratory growth cannot reproduce:

natural geological provenance.

A natural diamond is not merely a collection of optical specifications.

It is a physical geological artefact.

That matters to many collectors and jewellery buyers, and rightly so.

Rarity, provenance, history and natural formation can all form part of luxury.

Diamond is crystalline carbon with a refractive index of approximately 2.42, a Mohs hardness of 10, and an intrinsically singly refractive optical character resulting from its cubic crystal structure.

Real diamonds can nevertheless display strain-induced anomalous birefringence when examined between crossed polarisers. This does not make diamond fundamentally doubly refractive; it is an optical effect caused by internal strain within an otherwise isotropic crystal.

Laboratory-grown diamond: diamond created through science

A laboratory-grown diamond is also diamond.

It is not cubic zirconia.

It is not moissanite.

It is not glass.

It is crystalline carbon with essentially the same defining chemical, physical and optical properties as natural diamond.

The distinction is origin.

Rather than crystallising through geological processes within the Earth, laboratory-grown diamonds are commonly produced using HPHT—High Pressure High Temperature—or CVD—Chemical Vapor Deposition technology.

Natural, HPHT-grown and CVD-grown diamonds can differ in growth structures, trace impurities, defect centres, fluorescence, phosphorescence and strain characteristics. These differences allow specialist gemological laboratories to investigate their origin.

But fundamentally, they remain diamond.

That technological origin produces an unusual proposition in luxury.

You can acquire the optical characteristics of diamond without paying the same premium for geological scarcity.

For us, that is one of the great attractions of laboratory-grown diamond.

We like big gems.

We like exceptional colour and clarity.

We like extraordinary cutting.

And laboratory growth allows considerably more of a jewellery budget to be directed towards size and visual performance rather than geological rarity.

Is a lab-grown diamond as sparkly as a mined diamond?

Yes—assuming comparable cut quality and optical characteristics.

This is one of the most important points in the entire comparison.

Natural and laboratory-grown diamond are not two fundamentally different optical materials.

They are both diamond.

A properly cut laboratory-grown diamond therefore does not inherently have less brilliance because it was created in a laboratory.

Its optical performance is primarily governed by the same factors that matter in natural diamond:

• refractive index

• facet geometry

• proportions

• symmetry

• polish

• transparency

• inclusions

• colour

• light environment

Origin itself does not magically create additional sparkle.

An exceptionally cut laboratory-grown diamond can outperform a poorly cut natural diamond visually.

Likewise, an exceptionally cut natural diamond can be magnificent.

This is why Gemdrop® believes cut and optical performance deserve considerably more attention than origin alone.

Why moissanite can produce exceptionally strong fire

This is where the comparison gets particularly interesting.

Diamond has an extraordinarily high refractive index of approximately 2.42.

Moissanite is higher still.

Gemological references report refractive indices of approximately 2.648 and 2.691 for synthetic moissanite and dispersion of approximately 0.104. Its Mohs hardness is approximately 9¼.

Diamond's dispersion is approximately 0.044.

Dispersion describes the separation of white light into its spectral colours.

In jewellery, we experience that as fire: flashes of red, blue, green, orange and other colours as the gem, observer or light source moves.

Moissanite's dispersion is therefore substantially greater than diamond's.

Its substantially greater dispersion gives moissanite the potential to produce stronger spectral fire than diamond under comparable cutting and lighting conditions.

That does not mean every moissanite will automatically display more visible fire than every diamond. Observable fire also depends on facet geometry, proportions, cutting quality, lighting and viewing conditions.

But the underlying optical property is unambiguous:

moissanite is an exceptionally dispersive gem material.

Not imitation fire.

Not fake sparkle.

A different optical response produced by a different crystalline material.

Is moissanite more brilliant than diamond?

The word brilliance needs some care.

In everyday language people often use brilliance to mean simply “how sparkly is it?”

Gemologically, optical appearance is more complicated.

Diamond and moissanite both have very high refractive indices and, when appropriately proportioned and cut, can exhibit exceptional brightness and brilliance.

Refractive index is important because it affects how light behaves within the gem, but refractive index alone does not determine brilliance.

Facet geometry, critical angles, proportions, symmetry, polish, obstruction, leakage, dispersion and illumination all contribute to the final visual performance of a faceted gem.

Moissanite also possesses much greater dispersion than diamond, which tends to produce more pronounced coloured flashes.

Whether somebody considers that better is subjective.

Some people love the cooler, sharper flashes associated with fine diamond.

Others adore the dramatic spectral fire of moissanite.

We fall firmly into the category of people who believe there is room to appreciate both.

Diamond is singly refractive. Moissanite is doubly refractive.

There is another fundamental optical difference.

Diamond is intrinsically singly refractive.

Moissanite is doubly refractive, or birefringent.

Doubly refractive gems can split incident light into two rays travelling through the crystal at different velocities, whereas intrinsically singly refractive materials such as diamond do not.

In moissanite, this optical anisotropy can produce visible doubling of facet junctions under magnification and has historically been one of the useful gemological characteristics for distinguishing moissanite from diamond.

Diamond can show anomalous birefringence caused by internal strain, but this is different from the intrinsic birefringence produced by the crystal structure of moissanite.

And double refraction does not mean:

“twice the refraction = twice the sparkle.”

That would be scientifically wrong.

But combined with moissanite's very high refractive index and unusually high dispersion, its optical system gives the material a distinctive and often spectacular appearance.

Diamond has the classic diamond look.

Moissanite has its own.

Which is harder: diamond or moissanite?

Diamond wins.

Diamond defines 10 on the Mohs hardness scale.

Moissanite is approximately 9.25.

That makes diamond the harder material—but it also makes moissanite exceptionally hard by almost any jewellery standard.

This distinction needs perspective.

The Mohs scale is not linear.

And hardness refers specifically to resistance to scratching, rather than every aspect of durability.

Hardness should not be confused with toughness, which describes resistance to breaking, chipping or fracturing.

Both diamond and moissanite are highly suitable for jewellery designed for regular wear.

For rings, earrings, pendants and other pieces, moissanite's exceptional hardness is one reason it has become such an important jewellery material.

Which stays cleaner: diamond or moissanite?

Diamond has a well-known affinity for oils, which helps explain why fingerprints, cosmetics and skin oils can quickly reduce the crisp optical appearance of a diamond.

However, claims that moissanite is universally “oil repellent” or carries some simple opposite surface charge should be treated cautiously.

Surface behaviour in both diamond and silicon carbide depends upon surface chemistry, termination, oxidation, contamination and treatment.

Scientific studies of both materials demonstrate that wettability can change dramatically with surface condition.

The useful practical conclusion is simpler:

keep either gem clean.

A thin film of oil or other contamination on facets can interfere with the interaction of light with a faceted gem. Regular cleaning can therefore make a surprisingly large difference to apparent brilliance.

At Gemdrop®, we would rather make the scientifically defensible claim than invent a miracle surface property.

The value question

And then we arrive at the part that changes the decision for many buyers.

Money.

Natural diamond, laboratory-grown diamond and moissanite allocate your jewellery budget very differently.

That does not make one financially right and another financially wrong.

It means each purchase has a different value proposition.

Natural diamond: paying for geological rarity

When you purchase a natural diamond, part of your acquisition cost reflects qualities that laboratory growth cannot manufacture:

natural origin and geological scarcity.

That scarcity can carry cultural, collector and secondary-market value.

Natural diamonds also have a substantially more established resale ecosystem than laboratory-grown diamonds or moissanite.

But that does not mean ordinary retail diamonds should automatically be treated as appreciating financial assets.

Natural diamond prices fluctuate.

Market values can rise or fall according to size, quality, rarity, fashion, economic conditions and supply-and-demand dynamics.

A beautiful natural diamond may be an excellent luxury purchase.

It may carry meaningful residual value.

Certain exceptional diamonds may become highly collectible.

But the ordinary retail buyer should distinguish emotional investment, luxury acquisition and geological collecting from the expected returns of conventional financial securities.

Laboratory-grown diamond: directing more of the budget into the gem

Laboratory-grown diamond changes that capital allocation.

Instead of paying a substantial geological scarcity premium, considerably more purchasing power can often be directed towards:

carat weight, colour, clarity and cut.

The market separation between laboratory-grown and natural diamond has become enormous.

Individual prices vary significantly according to specification, grading, seller, cut and market conditions, so headline averages should never be interpreted as like-for-like quotations for equivalent diamonds.

The broader pattern, however, is clear:

laboratory-grown diamond generally allows consumers to purchase substantially more diamond size and specification for a given initial budget than natural diamond.

The value proposition is therefore different.

With natural diamond you are partly buying rarity and provenance.

With laboratory-grown diamond you can deploy more of the same jewellery budget into optical scale and quality.

A £5,000 jewellery budget does not have to answer:

“How much geological rarity can I afford?”

It can instead ask:

“How extraordinary a diamond can I create?”

That is a fundamentally different luxury proposition.

And it is one we love.

Do lab-grown diamonds hold their value?

Consumers should generally approach laboratory-grown diamonds principally as a luxury consumption purchase rather than a store of financial value.

Laboratory-grown diamond manufacturing has become dramatically more efficient, and market prices have fallen substantially as production has scaled.

For somebody whose primary objective is resale value, this matters.

For somebody whose primary objective is acquiring a spectacular diamond to wear, falling production costs can be part of the attraction.

The advancing economics of crystal growth mean that extraordinarily large, clean diamonds are becoming accessible to people who historically could never have considered them.

In practical terms, the buyer sacrifices much of the geological scarcity premium—and potentially some residual-value potential—in exchange for considerably greater present-day gem utility.

We think of this as maximising the return on enjoyment.

More diamond.

More visual impact.

More freedom in design.

More sparkle for the same jewellery budget.

Space Diamond™: exceptional optical performance at an accessible cost

Moissanite pushes that equation further.

It is not diamond and should never be sold as diamond.

But judged as a high-performance gem material, its specification is extraordinary:

Refractive index: approximately 2.65–2.69
Dispersion: approximately 0.104
Mohs hardness: approximately 9.25
Optical character: doubly refractive
Composition: silicon carbide, SiC

Its value proposition is therefore remarkably straightforward.

You can acquire a very large, highly durable and exceptionally fiery gem for a fraction of the expenditure typically required for a comparable-sized natural diamond.

That leaves more of the jewellery budget available elsewhere.

Perhaps it goes into platinum.

Perhaps bespoke craftsmanship.

Perhaps a more elaborate setting.

Perhaps several pieces rather than one.

Perhaps it simply stays in your bank account.

Luxury does not require spending the maximum amount available.

Sometimes luxury is knowing exactly where you want your money to work.

Natural diamond vs lab diamond vs Space Diamond™: the scientific comparison

Note: both natural and laboratory-grown diamond may display anomalous birefringence caused by internal strain despite diamond's intrinsically singly refractive cubic crystal structure.

Which gives you the most sparkle for your money?

If by sparkle you specifically mean the potential for strong spectral fire relative to purchase price, Space Diamond™ [moissanite] are difficult to beat.

Its dispersion is substantially higher than diamond's, although the actual visible fire of any individual gem remains dependent on cut, proportions, lighting and viewing conditions.

If you specifically want diamond, laboratory-grown diamond can deliver dramatically greater carat weight and specification for a given jewellery budget than natural diamond.

If you want the rarity and provenance of a crystal formed naturally within the Earth, natural diamond offers something neither laboratory growth process can provide.

That leads to three very different approaches:

Acquire rarity

Choose natural diamond.

Acquire maximum diamond

Choose laboratory-grown diamond.

Acquire maximum optical theatre

Choose Space Diamond™ moissanite.

That is a much more useful framework than asking which one is simply “best.”

Is moissanite a fake diamond?

No.

And we think calling it one does the material a disservice.

Moissanite is not diamond.

But sapphire is not diamond either.

Ruby is not diamond.

Emerald is not diamond.

A gem does not need to be diamond in order to be extraordinary.

Moissanite is crystalline silicon carbide: one of the hardest jewellery materials available, possessing a higher refractive index and substantially greater dispersion than diamond.

It deserves to be evaluated as moissanite, rather than perpetually apologising for not being something else.

Is a lab-grown diamond a fake diamond?

No.

Laboratory-grown diamond is diamond.

The scientific distinction is principally one of origin and growth history, not fundamental material identity.

Natural diamond represents an extraordinary achievement of geology.

Laboratory-grown diamond represents an extraordinary achievement of materials science.

We see value in both.

So which would Gemdrop® choose?

All three can be exceptional.

A magnificent natural diamond can be one of the most compelling geological objects a person can own.

We understand why people value that.

A magnificent laboratory-grown diamond gives us something different: the same extraordinary diamond material, but with the ability to pursue ambitious size, colour and clarity without allocating most of the budget to geological rarity.

We love that too.

And Space Diamond™ offers something else again: an extraordinary silicon-carbide crystal with enormous potential for spectral fire, superb durability and one of the strangest geological and cosmochemical stories in the gem world.

Gemdrop® specialises in lab gems because that is where our fascination lies.

We are interested in what happens when materials science removes geological scarcity as the limiting variable.

Suddenly a jewellery budget can buy a much bigger diamond.

A cleaner diamond.

A more ambitious design.

Or a spectacular moissanite exploding with spectral colour.

It changes the question from:

“How much rarity can I afford?”

to:

“What can I create?”

For us, that is where modern luxury becomes interesting.

Frequently Asked Questions

Is Space Diamond™ actually from space?

Space Diamond™ is Gemdrop's name for laboratory-grown moissanite.

The jewellery gem itself is not claimed to have been recovered from a meteorite.

The name references moissanite's genuine scientific history: natural silicon carbide was famously identified by Henri Moissan in material associated with the Canyon Diablo meteorite, and SiC has subsequently been identified in other extraterrestrial material, including presolar grains, as well as exceptionally rare terrestrial geological environments.

Is moissanite a diamond?

No.

Diamond is crystalline carbon.

Moissanite is crystalline silicon carbide.

Is lab-grown diamond real diamond?

Yes.

Laboratory-grown diamond is crystalline diamond produced technologically rather than through natural geological formation.

Natural and laboratory-grown diamonds have essentially the same defining chemical composition, crystal structure and fundamental physical and optical properties, although growth-related defects, impurities and other diagnostic characteristics can differ.

Does moissanite sparkle more than diamond?

That depends on what is meant by “sparkle.”

Moissanite has substantially greater dispersion than diamond, giving it the potential to produce stronger spectral flashes or fire under comparable conditions.

Overall visual appearance also depends heavily on cut, facet geometry, proportions, polish, lighting and viewing conditions.

Is moissanite harder than diamond?

No.

Diamond has a Mohs hardness of 10.

Moissanite is approximately 9.25, making it somewhat softer than diamond but still exceptionally hard for jewellery.

Remember that hardness means resistance to scratching and is not identical to overall toughness or resistance to fracture.

Is natural diamond better than lab-grown diamond?

Not as a universal scientific proposition.

They have different origins and different economic and cultural propositions.

Natural diamond offers geological rarity and provenance.

Laboratory-grown diamond offers diamond material without the same geological scarcity premium.

Which is preferable depends on what the buyer values.

Which is the best financial choice?

That depends on the objective.

Natural diamond generally has the strongest established secondary market of the three.

Laboratory-grown diamond generally allows substantially greater size and specification for the initial purchase price.

Moissanite typically requires the smallest initial expenditure while delivering exceptional optical performance and durability.

None should automatically be assumed to appreciate like a conventional financial asset.

Why is lab-grown diamond so much cheaper?

Diamond crystal-growth technology has become increasingly scalable and efficient.

Laboratory production removes geological rarity and much of the exploration and extraction constraint from the supply equation.

Competition, manufacturing efficiency and expanding production capacity have also contributed to declining laboratory-grown diamond prices.

Is moissanite more brilliant than diamond?

There is no scientifically useful universal answer based solely on refractive index.

Both are exceptionally high-performing optical materials.

Moissanite has a higher refractive index and much greater dispersion, producing a characteristically fiery appearance.

Diamond has its own distinctive optical appearance.

The actual brightness, brilliance and fire of an individual faceted gem depend heavily on its cut, proportions and lighting environment.

The Gemdrop® Position

Natural diamond is extraordinary.

Laboratory-grown diamond is extraordinary.

Moissanite is extraordinary.

They do not need to diminish one another.

A natural diamond tells a story of geology, pressure, time and extraordinary geological processes.

A laboratory-grown diamond tells a story of human understanding: our ability to reproduce the physical and chemical conditions necessary to grow one of nature's most remarkable crystalline materials.

And moissanite tells perhaps the remarkable story of all: a extremely rare silicon-carbide mineral first famously recognised in meteoritic material, subsequently discovered in both extraterrestrial and rare terrestrial environments, and transformed by materials science into one of the highest-performing gems available for jewellery.

Luxury no longer gives us only one answer.

It gives us a portfolio of possibilities.

Rarity.

Scale.

Operformance.

We provide the scientific information basis so that you can make an informed decision on the origin, and performance that means something to you.

At Gemdrop®, our fascination lies in making the world’s most advanced laboratory-grown gems accessible through science, transparency and trust—empowering collectors, creators, jewellers and designers to innovate without compromise, build enduring enterprises, create lasting value, and share the sparkle and joy inspired by the world’s finest scientifically verified laboratory-grown gems.

Big Gems. Ethical Sparkle. Extraordinary Sparkle.