Moissanite vs Diamond Australia: A Complete Comparison Guide

Moissanite vs Diamond Australia: A Complete Comparison Guide

Moissanite and diamonds are the two most widely compared gemstones in Australian fine jewellery right now. They are optically similar, physically durable, and sit at meaningfully different price points. For buyers who want to understand both materials before making a decision, this guide covers everything: what each material is, how they differ in appearance and durability, how pricing works in Australia, and how ethical sourcing considerations apply to both.

Bellari offers both. The moissanite range covers tennis bracelets, tennis necklaces, stud earrings, eternity bands, and rings, all set in rhodium plated sterling silver. The lab grown diamond range covers solitaire necklaces in four cuts, set in 18K solid gold, IGI certified, and made to order. This guide is written to help buyers understand both materials on their own terms.

(Explore diamond and moissanite jewellery)

What Is Moissanite?

Moissanite is a gemstone composed of silicon carbide (SiC). It occurs naturally in extremely rare quantities, first discovered in 1893 by Henri Moissan in a meteorite crater in Arizona. Natural moissanite is so scarce that virtually all moissanite in jewellery today is grown in a laboratory. This laboratory origin is not a limitation. It is simply how moissanite is produced at any practical scale.

Moissanite has a Mohs hardness rating of 9.25, which makes it the second hardest gemstone used in jewellery after diamond. It has a refractive index of 2.65, higher than diamond, which gives it exceptional brilliance and fire. It is a durable, optically impressive gemstone with a distinct character.

Moissanite is not a diamond simulant in the deceptive sense. It does not try to be a diamond. It is its own material with its own optical signature.

What Is a Diamond?

A diamond is a gemstone composed of pure carbon arranged in a crystal lattice structure. It is the hardest naturally occurring material on earth, rated 10 on the Mohs hardness scale. Diamonds form naturally deep in the earth's mantle under extreme heat and pressure over billions of years. They are brought to the surface through volcanic activity.

The same material, pure carbon in a diamond crystal structure, can also be grown in a laboratory, producing what is known as a lab grown diamond. Lab grown diamonds have the same chemical composition, the same optical properties, and the same hardness as mined diamonds. The difference is origin, not material.

Diamonds are graded using the 4Cs: cut, colour, clarity, and carat weight. Independent laboratories including the International Gemological Institute (IGI) and the Gemological Institute of America (GIA) certify diamonds using these criteria.

Are Lab Grown Diamonds the Same as Mined Diamonds?

Yes, in all material respects. A lab grown diamond and a mined diamond are the same substance: pure crystalline carbon. They have the same refractive index (2.42), the same hardness (10 on the Mohs scale), and the same capacity for brilliance, fire, and scintillation.

The GIA and IGI both grade lab grown diamonds using the same 4Cs framework as mined diamonds. A lab grown diamond can achieve a D colour grade (colourless), an Excellent cut grade, and a Flawless clarity grade — identical top grades to any mined stone.

Lab grown diamonds are produced using one of two methods: CVD (Chemical Vapour Deposition), in which carbon is deposited layer by layer onto a diamond seed crystal in a gas chamber, or HPHT (High Pressure High Temperature), in which a carbon source is exposed to extreme heat and pressure to grow a crystal around a seed. The production method does not affect the quality of the finished stone.

The primary differences between lab grown and mined diamonds are origin, traceability, and price. Lab grown diamonds are priced substantially below mined diamonds of equivalent grading, making fine jewellery in 18K solid gold significantly more accessible.

Moissanite vs Diamond: The Key Differences

Hardness and Durability

Diamond rates 10 on the Mohs hardness scale — the maximum. It is the hardest natural material on earth. Moissanite rates 9.25, making it the second hardest gemstone used in jewellery. Both materials are suitable for daily wear.

In practical terms, the difference in hardness between 9.25 and 10 is not perceptible during everyday wear. Moissanite will not scratch from contact with common surfaces. It will not chip from normal handling. For jewellery worn daily — rings, bracelets, necklaces — both moissanite and diamond will maintain their surface quality over a lifetime with standard care.

The hardness difference becomes more relevant in very specific industrial or abrasion contexts that do not apply to jewellery wear. For buyers concerned about longevity, both materials perform well.

Brilliance, Fire, and Scintillation

Brilliance, fire, and scintillation are three distinct aspects of how a gemstone interacts with light.

Brilliance refers to the white light reflected from the interior of the stone back through the table to the viewer's eye. Fire refers to the dispersion of light into spectral colours (the rainbow flashes visible in a stone). Scintillation refers to the pattern of light and shadow produced when the stone, the light source, or the viewer moves.

Moissanite has a refractive index of 2.65 and a dispersion rating of 0.104. Diamond has a refractive index of 2.42 and a dispersion rating of 0.044. In plain terms, moissanite produces more fire than a diamond of equivalent size. Under direct light, moissanite creates more rainbow dispersion. Under diffuse or natural light, this difference is less pronounced.

Some buyers find moissanite's light performance spectacular. Others find a diamond's more restrained fire — with its emphasis on white light brilliance — more aesthetically suited to their preference. Neither is objectively superior. They are different optical characters.

A diamond with an Excellent cut grade is optimised for balanced light performance. A round brilliant moissanite is designed to maximise fire. Buyers who prefer a quieter optical character in a large stone may prefer a diamond. Buyers who want maximum sparkle from a smaller stone may prefer moissanite.

Colour

Diamonds are graded on a colour scale from D (colourless) to Z (light yellow or brown tint). The higher grades (D through F) are considered colourless. The lower grades introduce a warm tint that affects the stone's appearance against white metal settings.

Moissanite is produced to a colour equivalent in the near-colourless to colourless range. Premium moissanite, including the stones in the Bellari range, is produced to a D colour equivalent: the highest colour grade, with no yellow or grey tint.

Both moissanite and diamond are available in near-colourless and colourless grades. The colour difference between a top-grade moissanite and a top-grade diamond is not visible to the naked eye under normal conditions.

Price in Australia

This is the most significant practical difference between the two materials.

Moissanite is substantially more accessible than diamond at equivalent visible sizes. The Bellari moissanite range — tennis bracelets, tennis necklaces, stud earrings, eternity bands, and rings in rhodium plated sterling silver — is priced to reflect the material and setting without the premium associated with diamond.

Lab grown diamonds in Australia are priced below mined diamonds of equivalent grading. The reduction in price relative to mined diamonds reflects the lower cost of laboratory production compared to geological extraction. Lab grown diamond prices have decreased significantly since 2020 as production capacity has scaled globally. As of 2026, lab grown diamonds cost substantially less than mined diamonds of equivalent cut, colour, clarity, and carat weight.

Mined diamonds carry the highest price, reflecting rarity, extraction cost, and the supply chain from mine to market.

The Bellari lab grown diamond solitaire necklace range starts at $1,840 AUD. This is an 18K solid gold, IGI certified fine jewellery piece. A mined diamond solitaire necklace of comparable quality would cost considerably more.

Buyers choosing between moissanite and lab grown diamond in Australia are making a decision about price point, material, and setting metal — not about which gemstone is objectively superior.

Origin and Ethical Sourcing

Moissanite is a laboratory grown material. Its supply chain is short and traceable: the stone is grown in a controlled facility, processed, cut, and set. There is no mining involved, no land displacement, and no geological extraction. Moissanite's origin is inherently documentable.

Lab grown diamonds also have a laboratory origin. The same advantages of supply chain transparency apply. Two production methods are used — CVD and HPHT — both of which occur in a controlled environment without the land disruption of open-cast mining.

Mined diamonds carry a more complex supply chain history. The Kimberley Process Certification Scheme was established in 2003 to prevent conflict diamonds from entering the supply chain, though its scope and effectiveness have been debated. Mined diamond supply chains vary significantly by origin. Buyers concerned about mined diamond sourcing should look for transparency from their retailer about stone provenance.

Both moissanite and lab grown diamonds offer greater supply chain transparency than mined diamonds by virtue of their laboratory origin.

Certification

Diamonds both mined and lab grown are certified by independent gemological laboratories. The most widely recognised in Australia are:

IGI (International Gemological Institute): Grades the 4Cs (cut, colour, clarity, carat) and is the most commonly used certification body for lab grown diamonds globally. Every diamond in the Bellari range carries an IGI certificate.

GIA (Gemological Institute of America): The original developer of the 4Cs framework. GIA is widely considered the benchmark for mined diamond certification and also certifies lab grown diamonds.

An IGI or GIA certificate is a permanent, verifiable record of a stone's grading. The certificate number is inscribed on the stone's girdle and can be independently verified through the laboratory's online database.

Moissanite is not graded using the same 4Cs system. Premium moissanite, including the stones used in the Bellari range, is assessed by the manufacturer to a colour equivalent grade (D colour) and cut quality specification. Moissanite does not carry IGI or GIA certification because it is a distinct material from diamond with its own grading conventions.

For buyers for whom third-party certification is important, the lab grown diamond offers a formal, independent verification of the stone's quality that moissanite does not provide in the same format.

Long-Term Care and Maintenance

Both moissanite and diamond are durable gemstones suitable for daily wear. Care requirements are similar:

Clean with warm water, mild dish soap, and a soft brush. Rinse thoroughly and dry with a lint-free cloth. Both materials resist scratching from everyday surfaces. Both can be worn in water, though chlorinated pools are best avoided, as chlorine can affect metal settings over time.

Diamonds: periodic inspection of the setting prongs or bezel by a jeweller is standard maintenance, particularly for solitaire pendants where the setting bears the weight of the stone.

Moissanite: the same setting inspection applies. The stone itself requires no special treatment beyond gentle cleaning.

Moissanite vs Diamond: Side by Side

Moissanite vs Lab Grown Diamond: How to Choose

Since Bellari carries both moissanite and lab grown diamonds, this comparison is directly relevant to buyers considering either range.

Moissanite and lab grown diamonds are different materials. They are not interchangeable options where one is a substitute for the other. They have different compositions, different optical characters, different price points, and different settings at Bellari.

The decision is more straightforward than buyers often expect. The clearest way to think about it:

Moissanite is the right choice if the buyer is drawn to the material itself its exceptional light performance, its accessibility at multiple price points, and its availability across a wider range of jewellery types (bracelets, necklaces, earrings, rings). The Bellari moissanite range is set in rhodium plated 925 sterling silver, which is a durable and versatile setting metal.

Lab grown diamond is the right choice if the buyer specifically wants a diamond, the same material as a mined stone, with independent IGI certification, set in 18K solid gold. The Bellari diamond range is a fine jewellery product at a significant price point ($1,840 to $2,090 AUD). It is a considered, long-term purchase for buyers who want the specific properties of diamond in an 18K gold setting.

There is no hierarchy between the two. They serve different buyer intentions and different moments.

Does Moissanite Look Like a Diamond?

Under most lighting conditions, a high-quality moissanite and a high-quality diamond are visually indistinguishable to the naked eye. Both appear as colourless, brilliant stones when set in jewellery. The difference in appearance becomes more visible under strong directional lighting, where moissanite's higher dispersion (fire) produces more rainbow flashes than a diamond of equivalent size.

For buyers wearing moissanite jewellery in everyday conditions — natural light, office lighting, indoor social settings — the stone does not read differently from a diamond. Jewellers and gemologists can distinguish moissanite from diamond using a thermal conductivity probe or other specialist equipment, but this distinction is not perceptible through observation.

The question of whether moissanite "looks like" a diamond is, in any practical sense, answered yes.

Does Moissanite Get Cloudy Over Time?

No. Moissanite does not get cloudy with age or wear. Silicon carbide is a chemically stable material that does not react with the oils, sweat, cosmetics, or cleaning products it encounters during normal jewellery wear. The stone will not develop internal cloudiness or surface deterioration over time.

The appearance of cloudiness sometimes seen in older moissanite pieces is the result of surface build-up — residue from skin oils, soap, or hand cream deposited on the stone's surface. This is not structural degradation. It is removed completely with a gentle clean using warm water and dish soap.

A moissanite stone maintained with basic cleaning will maintain its optical performance indefinitely. The stone itself does not deteriorate.

What Is the Difference in Price Between Moissanite and Diamond in Australia?

The price difference between moissanite and diamond in Australia reflects the cost of material production, the metal setting, and the certification requirements of each.

Moissanite is the most accessible price point. A moissanite tennis bracelet in rhodium plated silver can be purchased at a fraction of the cost of a diamond piece of equivalent visual size and quality.

Lab grown diamonds are substantially more accessible than mined diamonds. As of 2026, lab grown diamonds are priced significantly below mined diamonds of equivalent grading — the gap has widened as production capacity has increased globally over the past five years. The Bellari lab grown diamond solitaire necklace collection starts at $1,840 AUD in 18K solid gold with IGI certification.

Mined diamonds carry the highest price, driven by the cost of geological extraction, sorting, cutting, and distribution through the traditional supply chain.

For Australian buyers, the choice between moissanite and lab grown diamond involves a meaningful price difference. Both offer significant advantages over mined diamonds in terms of price relative to quality and supply chain transparency.

Is Moissanite an Ethical Choice?

Yes. Moissanite is produced in a laboratory with a traceable, documented supply chain. It does not involve mining, land displacement, or the complex ethical considerations associated with some mined gemstone supply chains.

For buyers for whom ethical sourcing is a priority, both moissanite and lab grown diamonds offer a clear alternative to mined stones. The origin of each stone can be verified. There is no ambiguity about provenance.

The ethical comparison between moissanite and lab grown diamond is broadly equivalent: both are laboratory produced, both eliminate the supply chain complexity of mined stones, and both have a significantly lower land-use impact than mining. The energy required to grow diamonds or moissanite in a laboratory varies by facility and energy source, which is a relevant consideration for buyers focused on environmental footprint.

Moissanite and Diamond Jewellery at Bellari

Bellari is a Sydney-based boutique fine jewellery brand. Both the moissanite and lab grown diamond ranges are designed in Sydney, made to careful quality specifications, and presented with the same editorial restraint across both product lines.

The Moissanite Range

The Bellari moissanite range covers:

Tennis bracelets in 2mm and 3mm widths. The moissanite tennis bracelet collection includes both widths, set in rhodium plated 925 sterling silver. A size guide is available for buyers choosing between bracelet sizes.

Tennis necklaces in 2mm and 3mm widths, in 16-inch and 18-inch lengths. Available via the necklace collection. The tennis necklace and tennis bracelet set is also available for buyers who want a coordinated pairing.

Stud earrings in oval, round, pear, radiant, and emerald cut. Available in the earrings collection.

Eternity bands in 2mm and 3mm widths, available in rhodium plated 925 sterling silver and in 10K solid gold. Available in the rings collection.

All moissanite stones in the Bellari range are produced to a D colour equivalent: colourless, with no yellow or grey tint. The Bellari Sparkle Guide covers moissanite material education in detail.

The Lab Grown Diamond Range

The Bellari lab grown diamond solitaire necklace collection is available in four cuts and two metal options. Every stone is IGI certified. The collection is made to order and designed in Sydney.

Round brilliant: Round brilliant diamond necklace in 18K yellow gold | Round brilliant in 18K white gold

Oval: Oval diamond necklace in 18K yellow gold | Oval in 18K white gold

Pear: Pear diamond necklace in 18K yellow gold | Pear in 18K white gold

Emerald cut: Emerald cut diamond necklace in 18K yellow gold | Emerald cut in 18K white gold

The full lab grown diamond solitaire necklace collection is available on the Bellari website. Pricing starts at $1,840 AUD.

Moissanite vs Diamond: Summary

Moissanite and diamonds — whether lab grown or mined — are distinct materials with distinct properties, price points, and buyer profiles.

Moissanite (silicon carbide, hardness 9.25, refractive index 2.65) is a laboratory grown gemstone with exceptional light performance, a traceable supply chain, and a significantly lower price point than diamond. It is available in a wide range of jewellery types and is appropriate for daily wear across all settings.

Lab grown diamonds (pure carbon, hardness 10, refractive index 2.42) are chemically and physically identical to mined diamonds, independently certified by IGI or GIA, and available at a lower price than mined stones. They offer supply chain transparency and the specific material properties of diamond, in 18K solid gold settings.

Mined diamonds carry the same material properties as lab grown diamonds with a more complex supply chain and a higher price point.

For buyers in Australia comparing these materials, the decision turns on four things: which material is most relevant to their needs, which jewellery type they are looking for, what their price point is, and how important third-party certification is to them.

Both materials are honest choices. Neither requires justification relative to the other.

Frequently Asked Questions

Is moissanite the same as a diamond?

No. Moissanite and diamond are different materials. Moissanite is silicon carbide (SiC) with a hardness of 9.25 and a refractive index of 2.65. Diamond is pure crystalline carbon with a hardness of 10 and a refractive index of 2.42. They have different chemical compositions, different optical properties, and different origins. Both are genuine gemstones used in fine jewellery.

Is moissanite better than a diamond?

Moissanite and diamond have different properties that suit different buyers. Moissanite has a higher refractive index and produces more fire (rainbow dispersion) than a diamond. Diamond has greater hardness and has a more established cultural history in fine jewellery. Neither is objectively better. The right choice depends on what the buyer values: optical character, price point, setting metal, or material type.

How hard is moissanite compared to a diamond?

Diamond rates 10 on the Mohs hardness scale — the maximum. Moissanite rates 9.25. Both materials are appropriate for daily wear in jewellery. In practical terms, the difference is not perceptible during normal use. Both resist scratching from everyday contact with common surfaces.

What is the price difference between moissanite and diamond in Australia?

Moissanite is substantially more accessible than diamond at equivalent visible sizes. Lab grown diamonds are priced significantly below mined diamonds. As of 2026, lab grown diamond solitaire necklaces in 18K solid gold start at $1,840 AUD at Bellari. Moissanite pieces — tennis bracelets, necklaces, earrings, and rings in sterling silver — are available at lower price points across the Bellari range.

Does moissanite look like a diamond?

Under most lighting conditions, a high quality moissanite and a high quality diamond are visually indistinguishable to the naked eye. Under strong directional light, moissanite produces more rainbow dispersion (fire) than a diamond of equivalent size, due to its higher dispersion rating (0.104 vs. 0.044). In natural or diffuse indoor light, the two materials read similarly.

Does moissanite get cloudy?

No. Moissanite does not get cloudy with age or wear. Silicon carbide is chemically stable and does not react with the substances encountered during normal jewellery wear. The appearance of cloudiness in some stones is caused by surface residue — oils, soap, or cosmetic build-up — which is fully removed with gentle cleaning. The stone itself does not deteriorate.

Is a lab grown diamond a real diamond?

Yes. A lab grown diamond has the same chemical composition as a mined diamond — pure crystalline carbon — and the same physical properties, including hardness (10 on the Mohs scale), refractive index (2.42), and optical performance. Lab grown diamonds are graded using the same 4Cs criteria as mined diamonds by independent laboratories including IGI and GIA. The difference between a lab grown and mined diamond is origin, not material.

Is moissanite ethical?

Yes. Moissanite is grown in a laboratory, which means its supply chain is short, traceable, and does not involve mining or land displacement. Lab grown diamonds carry the same supply chain advantages. Both materials offer greater transparency than most mined gemstone supply chains. For buyers for whom ethical sourcing is a priority, both moissanite and lab grown diamonds are clear choices.

Which is better for daily wear, moissanite or diamond?

Both are suitable for daily wear. Diamond (hardness 10) is the hardest material available and will not scratch from contact with any naturally occurring surface. Moissanite (hardness 9.25) is the second hardest gemstone used in jewellery and also resists scratching from everyday contact. For practical purposes, both materials are appropriate for rings, bracelets, and necklaces worn daily.

Does Bellari carry both moissanite and lab grown diamonds?

Yes. Bellari's moissanite range includes tennis bracelets, tennis necklaces, stud earrings, eternity bands, and rings in rhodium plated 925 sterling silver. Bellari's lab grown diamond range covers solitaire necklaces in four cuts (round brilliant, oval, pear, and emerald) in 18K yellow gold and 18K white gold, all IGI certified and made to order. Details on both ranges are available on the Bellari website.