Moissanite vs Lab Grown Diamond Australia: A Complete Buyer's Guide

Moissanite and lab grown diamonds are two distinct gemstones. They are not versions of each other. They are made from different compounds, they behave differently under light, and they sit at different price points. This guide covers what separates the two, what they share, and how to assess which is the right material for the piece you are buying.

What Is the Difference Between Moissanite and a Lab Grown Diamond?

Moissanite is a gemstone made from silicon carbide (SiC). It was first discovered in 1893 by chemist Henri Moissan in a meteorite crater in Arizona. Natural moissanite is exceptionally rare; virtually all moissanite sold today is laboratory grown. A lab grown diamond is made from carbon — the same element as a mined diamond — grown in a laboratory environment using either Chemical Vapour Deposition (CVD) or High Pressure High Temperature (HPHT) processes. The result is a diamond that is chemically, physically and optically identical to one extracted from the earth.

The two materials look similar at a glance but are not the same substance. They have different chemical compositions, different refractive indexes, and different optical signatures. They are also priced differently, certified differently, and suited to slightly different buyer intentions.

Moissanite vs Lab Grown Diamond: Side by Side

The table below covers the key specifications that determine how each stone looks, wears and is priced in Australia.

How Each Stone Looks: Optical Properties Compared

The optical behaviour of moissanite and lab grown diamond is one of the clearest differences between the two. Both produce visible sparkle, but the type of sparkle is different.

Brilliance (White Light Return)

Brilliance refers to the return of white light through the top of a faceted stone. It is what most people describe when they say a stone looks "bright" or "alive."

Diamond — mined or lab grown — is optimised for brilliance. The refractive index of diamond is 2.42. A well-cut round brilliant diamond returns a high proportion of incoming white light back through its table. This produces the clean, bright sparkle most commonly associated with diamond jewellery.

Moissanite has a higher refractive index of 2.65 to 2.69. This means it bends light more strongly than diamond. The result is a stone that is optically very bright, but the light return is composed differently.

Fire (Colour Dispersion)

Fire is the separation of white light into its spectral colours as it passes through a gemstone. It produces the rainbow flashes visible in a stone as it moves.

Moissanite's fire rating is 0.104. Diamond's fire rating is 0.044. Moissanite disperses more than twice the coloured light of a diamond of equivalent size. Under certain lighting conditions — direct overhead light, sunlight, or strong artificial light — this produces vivid coloured flashes that are more intense than diamond.

In diffuse natural light, the difference between moissanite and lab grown diamond is less pronounced. In bright or directional light, moissanite shows more coloured fire; diamond produces more white brilliance.

How Each Stone Reads in Different Lighting Conditions

Natural light (daylight, outdoors): Both stones read as bright and lively. The fire difference between them is least visible in this setting. Both look excellent.

Artificial overhead light (office, retail): Moissanite shows stronger coloured dispersion. Diamond's white brilliance is more defined. The visual difference between the two materials is most visible in this lighting.

Evening and candlelight: Both stones produce fire. Moissanite may read as slightly more dramatic in low directional light. Diamond produces a warmer, more classic sparkle.

Neither reading is objectively superior. These are different optical signatures, not a hierarchy. Whether the higher fire of moissanite or the white brilliance of diamond is more appealing is a matter of preference, and one worth considering before purchasing.

Colour Grade and How It Affects Appearance

High-quality moissanite sold in Australia today is produced to D to F colour equivalent — the colourless end of the grading scale. At this grade, moissanite appears clear and bright in all lighting conditions.

Lab grown diamonds are individually graded by the International Gemological Institute (IGI) on the same D to Z colour scale used for mined diamonds. Bellari's lab grown diamond solitaire necklaces are sourced to the upper colour range, as documented in their individual IGI certificates.

For both materials, D to F colour represents the most visually clean option. Below F, slight warmth may be visible in certain cuts and lighting conditions. For everyday fine jewellery, D to F is the most consistently clear across all settings.

Hardness and Durability: Moissanite vs Lab Grown Diamond

Both materials are highly durable. For everyday jewellery wear, both are appropriate choices.

Moissanite hardness: 9.25 on the Mohs scale. Lab grown diamond hardness: 10 on the Mohs scale.

The Mohs scale measures a material's resistance to surface scratching. Diamond at 10 is the hardest natural substance known. Moissanite at 9.25 is the second-hardest gemstone commonly used in fine jewellery.

In practical terms, this means moissanite will not be scratched by any common household material — steel (around 6.5 Mohs), quartz dust in the environment (7 Mohs), and other gemstones below 9.25 will not mark its surface. Only a diamond can scratch moissanite.

For rings, bracelets, and other pieces that experience frequent contact with hard surfaces, the 0.75 Mohs difference between the two materials is relevant but not decisive for most wearers. Both stones will maintain their surface over decades of daily wear with normal care.

For earrings and necklaces, which experience minimal direct contact with hard surfaces, the hardness difference has no meaningful practical impact. Either material is appropriate.

Toughness (resistance to fracturing under impact) is a separate property from hardness. Both moissanite and lab grown diamond are tough materials. Neither is prone to chipping from normal wear, though both can fracture under severe concentrated impact — the same condition that can damage almost any hard material.

Price in Australia: What Each Material Costs

Moissanite and lab grown diamond are positioned at genuinely different price points. This is not a value hierarchy — it reflects the different materials, the different settings, and the different production processes involved.

Moissanite price range in Australia: Moissanite jewellery in Australia ranges from approximately $200 AUD for smaller sterling silver pieces to $1,000 AUD or above for larger pieces in solid gold settings. At Bellari, the moissanite earrings collection starts from $340 AUD, the moissanite tennis bracelet from $570 AUD, and the moissanite tennis necklace from $850 AUD.

Lab grown diamond price range in Australia: Lab grown diamond solitaire necklaces in 18K solid gold — IGI certified — typically range from $1,500 AUD to $4,000 AUD depending on carat weight, cut, gold type, and supplier. Bellari's lab grown diamond solitaire necklaces are priced from $1,840 AUD to $2,090 AUD.

Lab grown diamonds cost significantly less than mined diamonds of equivalent specifications. At 2026 pricing, a lab grown diamond typically represents 50 to 70 per cent of the cost of a comparable mined stone. This price gap has widened as production volume has increased.

What determines the price of each material:

For moissanite, price is largely determined by carat size (or millimetre diameter), setting metal, and the cut chosen. Moissanite itself is manufactured to consistent quality standards, so price variation within a quality range reflects the setting more than the stone.

For lab grown diamonds, price is determined by the four Cs as graded by IGI: cut, colour, clarity and carat weight. Each stone is individually priced. A D colour, VVS1 clarity, excellent cut stone will cost more than an F colour, VS2 clarity, good cut stone of the same carat weight, even within the lab grown category.

Certification: IGI for Lab Grown Diamonds and What Moissanite Certification Means

The certification landscape for the two materials is different, and it matters for buyers.

Lab grown diamond certification: Every quality lab grown diamond sold in fine jewellery should come with an IGI (International Gemological Institute) certificate. IGI is the world's most widely used independent gemological laboratory for lab grown diamond grading. An IGI certificate documents the individual stone's cut grade, colour grade, clarity grade, carat weight, measurements, and growth method (CVD or HPHT).

The certificate number is laser inscribed on the stone's girdle, allowing the diamond and its documentation to be matched and verified. This matters for provenance, insurance, and resale.

All Bellari lab grown diamond solitaire necklaces come with individual IGI certificates. You can read more about what IGI certification covers in the IGI certified diamond guide on The Edit.

Moissanite certification: Moissanite is a manufactured material produced to consistent specifications. Unlike natural or lab grown diamonds, where individual stones vary significantly in colour, clarity and cut quality, moissanite of the same product line is produced to the same grade range. For this reason, individual gemological certificates are not standard for moissanite in the way they are for diamonds.

Some moissanite retailers issue their own in-house quality cards or certificates. These are not the same as independent third-party grading. What matters for moissanite is the supplier's stated colour and clarity grade range, and their quality assurance process.

Bellari's moissanite pieces are sourced to D to F colour equivalent and VVS1 to VVS2 clarity equivalent across the range.

Which Metal Setting Works Best with Each Stone?

The setting metal affects both the appearance and the long-term wear of the piece. Moissanite and lab grown diamond are typically sold in different metal categories.

Moissanite settings: The majority of moissanite jewellery in Australia is set in rhodium plated 925 sterling silver. Rhodium plating adds a bright white hard surface to the silver base, which resists tarnishing and complements the cool optical properties of moissanite well. Over time, rhodium plating can wear on pieces that experience constant abrasion — rings and bracelets wear faster than earrings and necklaces.

Moissanite is also available in 10K, 14K and 18K solid gold settings from some suppliers, at higher price points. Bellari's moissanite eternity band is available in 10K solid gold as well as sterling silver.

Lab grown diamond settings: Lab grown diamonds in fine jewellery are typically set in solid 14K or 18K gold — yellow, white, or rose — or platinum. Solid gold settings are more durable than plated settings and do not require replating over the life of the piece. The metal adds intrinsic value to the setting and is appropriate for the price point of a certified lab grown diamond.

Bellari's lab grown diamond solitaire necklaces are set in solid 18K yellow gold or solid 18K white gold.

White gold vs yellow gold for diamond solitaire necklaces: White gold is rhodium plated at the point of manufacture, giving it a bright white colour. It may require replating every few years with heavy wear. Yellow gold does not require replating; its colour is inherent to the alloy.

For colourless (D to F) lab grown diamonds, both white and yellow gold are appropriate. Some buyers find that white gold emphasises the colourless quality of the stone; others prefer the contrast and warmth of yellow gold against a clear diamond. Both are standard choices in fine jewellery.

What Each Material Is Best Suited For

Moissanite and lab grown diamond are appropriate for different types of pieces and different buyer intentions. Neither is universally superior — the right choice depends on what the piece is, how it will be worn, and what the buyer values.

Moissanite: Use Cases and Jewellery Pieces

Tennis bracelets and tennis necklaces: Moissanite's high fire means each stone in a line catches light independently and with visible coloured dispersion. In a tennis bracelet or necklace where dozens of small stones are set together, this creates a dramatic, sparkle-rich look at a price point that makes the format accessible.

Stud earrings: Moissanite studs perform well in all five cuts (round, oval, pear, radiant, emerald) and at the 0.5 to 2.0 carat range that most earring buyers are looking for. The high refractive index means smaller stones still read clearly at earring distances.

Eternity bands and rings: Moissanite eternity bands are a practical choice for pieces that will be stacked or worn alongside other rings, where abrasion between pieces is likely. At 9.25 Mohs, moissanite holds up well in this context.

Gifting across multiple price points: Moissanite jewellery is available at price points ($300 to $900 AUD) that suit birthday, anniversary, and celebration gifting without requiring a significant financial commitment.

Bridal party and bridesmaid jewellery: Matching sets — stud earrings, tennis bracelets, or necklaces — in moissanite are a practical and visually consistent choice for bridal parties. Explore the moissanite bridal jewellery range for pieces suited to this context.

Lab Grown Diamond: Use Cases and Jewellery Pieces

Solitaire necklaces: A single lab grown diamond on a fine chain in solid 18K gold is one of the most considered and versatile pieces in fine jewellery. The solitaire format suits daily wear and significant occasions. It reads as understated up close and distinctly fine from a distance. Bellari offers four cuts in this format: round brilliant, oval, pear, and emerald — available in 18K yellow or white gold.

Milestone and significant gift giving: At $1,840 to $2,090 AUD with IGI certification, a lab grown diamond solitaire necklace is a considered gift for significant occasions — anniversaries, milestone birthdays, or moments that warrant a piece of lasting value. The certificate adds documentation and meaning alongside the piece.

Buyers who want a diamond: Some buyers specifically want the properties of a diamond — carbon composition, Mohs 10 hardness, white light brilliance, and individual gemological certification. For these buyers, moissanite is not a substitute; lab grown diamond is the appropriate material.

Long-term investment in a single piece: A solid 18K gold setting with an IGI certified stone is built to last without maintenance requirements that plated settings eventually require. Buyers making a single, significant fine jewellery purchase for daily wear often prefer this construction.

Ethical and Environmental Considerations

Both moissanite and lab grown diamond are produced in laboratory environments. Neither requires mining. This is a shared characteristic, and it matters to a growing proportion of buyers in Australia.

Moissanite's ethical profile: Moissanite is produced through a process that grows silicon carbide crystals in a controlled laboratory environment. The process does not involve mining, land disruption, or the labour conditions associated with artisanal diamond mining. The energy required to grow moissanite is considerably lower than for lab grown diamonds, which require sustained high temperature and pressure environments.

Lab grown diamond's ethical profile: Lab grown diamonds are grown in laboratory conditions that replicate the geological processes by which diamonds form naturally. The process requires significant energy — both CVD and HPHT methods are energy intensive. That said, they eliminate the supply chain concerns associated with mined diamonds: no land excavation, no displacement of communities, and no conflict mineral sourcing risk.

The energy intensity of lab grown diamond production is an ongoing consideration in the industry. Some producers source renewable energy for their growing facilities; the specifics vary by supplier and are worth asking about for buyers for whom this matters.

For buyers prioritising minimal environmental impact: Both materials avoid mining. Moissanite's production process is less energy intensive than lab grown diamond production. For buyers for whom energy consumption is the primary concern, moissanite has a lower production footprint.

For buyers prioritising ethical sourcing of diamond specifically: Lab grown diamonds offer the properties of diamond without the ethical supply chain risks of mined stones. IGI certification traces the growth method, providing documentation.

Moissanite or Lab Grown Diamond: How to Choose in Australia

The choice between moissanite and a lab grown diamond is not about which material is better. It is about which material is right for the specific piece, the specific buyer, and the specific use.

Work through these questions before deciding:

1. What type of piece are you buying?

For a tennis bracelet or tennis necklace, moissanite is the most available and most practical option in Australia. Lab grown diamond tennis pieces exist but are significantly more expensive and less widely available at fine quality in Australia.

For a solitaire necklace, both are available. The look and price are genuinely different. Moissanite solitaire necklaces tend to show more fire in a pendant format; lab grown diamond solitaires produce a cleaner, whiter look.

For earrings, moissanite is the dominant option at quality price points under $1,000 AUD. Lab grown diamond studs exist but sit at a considerably higher price point in solid gold settings.

For an eternity band or ring, both options exist. Moissanite rings and eternity bands in sterling silver or 10K gold; lab grown diamond rings in 14K or 18K gold.

2. What is your budget?

For pieces under $1,000 AUD: Moissanite in quality sterling silver settings covers most jewellery types at this level.

For pieces between $1,000 and $2,000 AUD: Both options are available depending on piece type. Moissanite in solid gold settings may be available in this range. Lab grown diamond solitaire necklaces in 18K gold begin at around $1,840 AUD.

For pieces above $2,000 AUD: Lab grown diamond in solid gold is the appropriate material for a certified solitaire piece in this range.

3. Do you want a certified individual stone?

If individual gemological certification (IGI) matters to you — for provenance, insurance, or personal preference — lab grown diamond is the appropriate choice. Moissanite is not individually certified by independent gemological laboratories.

4. Which optical character appeals to you more?

Moissanite: higher fire, more coloured light dispersion, vivid sparkle under directional light. Lab grown diamond: white brilliance, cleaner sparkle, classic diamond optical signature.

If you have not seen both materials in person, this is worth doing before purchasing. The optical difference is real and visible, and preference is personal.

5. Does the specific material matter to you?

Some buyers specifically want a diamond — its carbon composition, its Mohs 10 hardness, and its status as the most widely recognised gemstone in fine jewellery. For these buyers, lab grown diamond is the right answer.

Other buyers are drawn to moissanite specifically — its distinct optical properties, its origins in a meteorite, or its position as a genuine gemstone in its own right. For these buyers, moissanite is the right answer.

Many buyers are undecided and are making a practical evaluation. For these buyers, the guide above should help narrow the decision to piece type, budget, and optical preference.

What Bellari Offers in Moissanite and Lab Grown Diamond

Bellari is a Sydney-based boutique jewellery brand offering both product lines with the same standard of quality and editorial restraint.

Moissanite range: All Bellari moissanite pieces are set in rhodium plated 925 sterling silver and sourced to D to F colour equivalent, VVS1 to VVS2 clarity equivalent. The range includes:

• Moissanite tennis bracelets in 2mm and 3mm, from $570 AUD
• Moissanite tennis necklaces in 2mm and 3mm, 16-inch and 18-inch, from $850 AUD
• Moissanite stud earrings in round, oval, pear, radiant and emerald cuts, from $340 AUD
• Moissanite eternity bands in 2mm and 3mm (also available in 10K solid gold)
• Petal Pink Tennis Bracelet in 3mm moissanite, $860 AUD

The tennis bracelet and necklace are also available as a matched set.

Lab grown diamond range: All Bellari lab grown diamond pieces are set in solid 18K gold and come with individual IGI certificates. The range comprises solitaire necklaces in four cuts:

• Round brilliant diamond necklace in 18K yellow or white gold
• Oval diamond necklace in 18K yellow or white gold
• Pear diamond necklace in 18K yellow or white gold
• Emerald cut diamond necklace in 18K yellow or white gold

Prices range from $1,840 AUD to $2,090 AUD. All pieces are made to order and designed in Sydney.

For questions about either range — cut comparisons, sizing, or which piece suits a specific occasion — Bellari can be contacted at hello@bellari.com.au.

Summary: Moissanite vs Lab Grown Diamond Australia

Moissanite and lab grown diamond are different materials that serve different buyer intentions. Moissanite is a silicon carbide gemstone with a higher refractive index (2.65 to 2.69) and more fire (dispersion 0.104) than diamond. Lab grown diamond is carbon, chemically identical to mined diamond, graded individually by IGI, and set in solid gold at higher price points.

For buyers choosing between moissanite and lab grown diamond in Australia, the decision turns on four things: what piece you are buying, your budget, whether individual certification matters, and which optical character you prefer. Neither material is the correct answer for all buyers. They are different products that exist alongside each other, not in competition with each other.

Bellari's moissanite range begins at $340 AUD and covers tennis bracelets, tennis necklaces, stud earrings in five cuts, and eternity bands. The lab grown diamond solitaire necklace range runs from $1,840 to $2,090 AUD in solid 18K gold with IGI certification.

For buyers who have read this guide and are still uncertain, the most useful next step is to see both materials in person where possible — or to contact Bellari directly for guidance on which range suits your specific piece and context.

Frequently Asked Questions: Moissanite vs Lab Grown Diamond Australia

Is moissanite a lab grown diamond? No. Moissanite and lab grown diamonds are different materials. Moissanite is silicon carbide (SiC). Lab grown diamonds are carbon, grown in a laboratory to produce a stone that is chemically and physically identical to a mined diamond. They have different optical properties, different hardness levels, and different certifications.

Which is harder — moissanite or lab grown diamond? Lab grown diamond is harder. Diamond rates 10 on the Mohs scale, making it the hardest known substance. Moissanite rates 9.25, making it the second-hardest gemstone commonly used in fine jewellery. Both are highly scratch-resistant for everyday wear. For rings worn constantly alongside other hard materials, diamond's additional hardness is relevant. For earrings and necklaces, both are equally appropriate.

Does moissanite look like a diamond? At a distance, moissanite and diamond look similar. The visible difference is in fire — moissanite disperses more coloured light than diamond (dispersion 0.104 vs 0.044), which produces more rainbow-coloured flashes under directional light. In natural diffuse light, the two materials are harder to distinguish. Up close and under strong lighting, moissanite's higher fire is visible to most people. Whether this is an advantage or a disadvantage is a matter of preference.

Is a lab grown diamond a real diamond? Yes. A lab grown diamond is chemically, physically and optically identical to a mined diamond. Both are carbon in a cubic crystal structure. The International Gemological Institute (IGI) grades lab grown diamonds on the same 4C system — cut, colour, clarity, carat — used for mined diamonds. The difference is origin, not composition.

Is moissanite or lab grown diamond better value in Australia? This is not a straightforward comparison because the materials are different. Moissanite offers a visually similar sparkle to diamond at a significantly lower price point. Lab grown diamond offers the specific properties of diamond, individual IGI certification, and a solid gold setting, at a higher price point. Whether either represents better value depends on what the buyer is looking for. If you want a diamond, moissanite is not a substitute. If you want a high-sparkle fine gemstone and do not require it to be a diamond, moissanite is a genuine and appropriate choice.

What does IGI certified mean for a lab grown diamond? IGI (International Gemological Institute) is an independent gemological laboratory that grades individual diamonds on cut, colour, clarity and carat weight. An IGI certificate means the stone has been assessed by a third party and its specifications are documented independently of the seller. The certificate number is laser inscribed on the diamond's girdle for traceability. All Bellari lab grown diamond solitaire necklaces come with IGI certificates.

Does moissanite come with a certificate? Moissanite is not individually certified by independent gemological laboratories in the way diamonds are. Because moissanite is manufactured to consistent grade specifications, individual stone variation is less significant than for diamonds. What matters for moissanite is the supplier's stated colour and clarity grade range and their quality assurance process. Bellari moissanite is sourced to D to F colour equivalent and VVS1 to VVS2 clarity equivalent.

Can you wear moissanite and lab grown diamond together? Yes. Moissanite and lab grown diamond can be worn together without any practical concern. At 9.25 and 10 on the Mohs scale respectively, both are hard materials and neither will scratch the other in normal wear. Many buyers combine both — a moissanite tennis bracelet or stud earrings with a lab grown diamond solitaire necklace — to cover different piece types at different price points.

Which is more ethical — moissanite or lab grown diamond? Both are produced in laboratory environments with no mining involved. Moissanite production is less energy intensive than lab grown diamond production, which requires sustained high-temperature or high-pressure growing conditions. For buyers whose primary ethical concern is avoiding mined gemstones, both are appropriate. For buyers focused specifically on energy consumption, moissanite has a lower production footprint.

How do I choose between moissanite and lab grown diamond in Australia? Start with the piece type and budget. For tennis bracelets, necklaces and stud earrings under $1,000 AUD, moissanite covers most formats well. For a solitaire necklace in solid 18K gold with IGI certification, lab grown diamond is the appropriate material in the $1,840 to $2,090 AUD range. If individual certification matters to you, choose lab grown diamond. If optical preference is the main variable, consider whether you prefer moissanite's higher fire or diamond's white brilliance. If you want a material that is specifically a diamond, moissanite is not a substitute. If you want a high-quality, durable gemstone that is not required to be a diamond, moissanite is a genuine and considered choice.