What Is Moissanite? The Complete Guide to the Gemstone

What Is Moissanite? The Complete Guide to the Gemstone

Moissanite is a gemstone composed of silicon carbide, first identified in 1893 in a meteorite crater in Arizona by French chemist Henri Moissan. Natural moissanite is extremely rare. The moissanite used in jewellery today is grown in laboratory conditions, producing a stone that is chemically identical to the naturally occurring mineral, scores 9.25 on the Mohs hardness scale, and has a refractive index of 2.65 to 2.69, higher than diamond. It is available in colourless grades from D through F, in near-colourless grades, and in several stone cuts including round brilliant, oval, emerald, pear, and radiant.

This guide covers everything there is to know about moissanite: where it comes from, how it is made, how it is graded, how it compares to diamond and lab-grown diamond, what the GRA certificate means, which cut produces which effect, and what to expect from moissanite jewellery in daily wear.

For buying guides covering specific Bellari products, see the moissanite tennis bracelet guide, the durability and care guide, and the moissanite vs diamond comparison in The Edit.

The Origin of Moissanite

In 1893, Henri Moissan was examining rock samples from a meteorite crater in Canyon Diablo, Arizona. He identified small crystals he initially believed to be diamonds. After further analysis, he determined the crystals were composed of silicon carbide, a compound that had never been found naturally on Earth before. The mineral was later named moissanite in his honour. In 1906, Moissan received the Nobel Prize in Chemistry.

Natural moissanite has since been found in other geological sites, in certain types of meteorite, in geological formations created by high-pressure volcanic activity, and in rare deposits of silicon carbide inclusions within diamonds. In every case, the quantities are far too small for commercial use.

The commercial moissanite used in jewellery today was made possible by a crystal growing process developed by Charles and Colvard in North Carolina in the 1990s. Their method produced silicon carbide crystals of gemstone quality in controlled laboratory conditions. The technology has since been refined and is now used by multiple producers globally.

The stone that arrives in a piece of jewellery is, in every measurable way, chemically, physically, optically, identical to naturally occurring moissanite. The only difference is the circumstances of its formation.

What Moissanite Is Made Of

Moissanite is silicon carbide: a compound of silicon (Si) and carbon (C) in equal parts, bonded together in a crystal lattice. The chemical formula is SiC. This crystal structure gives moissanite its distinctive combination of hardness, toughness, and optical behaviour.

• Silicon Carbide Crystal Structure

Silicon carbide can form in more than 200 different crystal structures, known as polytypes. The polytype used in gemstone-quality moissanite is 6H-SiC, a hexagonal structure that produces the optical properties valued in fine jewellery. The hexagonal lattice is what gives moissanite its slight double-refraction, visible under magnification as a doubling of facet edges when viewed through the stone.

• Refractive Index: 2.65 to 2.69

The refractive index measures how strongly a material bends light as it passes through. Moissanite has a refractive index of 2.65 to 2.69. Diamond's refractive index is 2.42. A higher refractive index means more light is bent and returned through the crown of the stone, producing a brighter, more intense white light return known as brilliance.

• Dispersion: 0.104

Dispersion is the separation of white light into its spectral colours as it passes through the stone, the source of what is commonly called fire. Moissanite has a dispersion rate of 0.104. Diamond has a dispersion rate of 0.044. Moissanite's dispersion is more than twice that of diamond, which is why moissanite shows strong rainbow flashes of colour under direct or point-source lighting. Under diffused or natural ambient light, this difference is less pronounced.

How Moissanite Is Grown in a Laboratory

Laboratory-grown moissanite is produced through a thermal growing process. Silicon and carbon are combined at extremely high temperatures, above 2,000 degrees Celsius, in a controlled environment. Under these conditions, the elements crystallise into silicon carbide over a period of several weeks to months.

The raw crystal is then cut and polished using precision equipment. Because moissanite is very hard (9.25 on the Mohs scale), it requires diamond-tipped cutting tools. The cut applied to the stone determines how light enters and exits the pavilion, which directly determines the optical character of the finished piece.

The growing process produces a stone that is identical to naturally occurring moissanite in every scientific measure. It is not a synthetic imitation of moissanite — it is moissanite, grown under conditions that replicate those found in extreme natural environments.

• Moissanite Hardness and Durability

Hardness and durability are the properties most relevant to how a gemstone holds up in jewellery worn daily. Moissanite performs exceptionally well on both.

• Mohs Scale Position

The Mohs scale measures resistance to surface scratching on a scale from 1 (softest) to 10 (hardest). Diamond is the hardest known natural material at 10. Moissanite sits at 9.25, placing it above sapphire (9) and ruby (9). A stone at 9.25 on the Mohs scale is resistant to scratching from nearly all materials encountered in daily life. Surface scratching from routine wear is not a practical concern for moissanite.

• Toughness

Toughness is distinct from hardness. Hardness measures scratch resistance. Toughness measures resistance to fracturing or chipping under impact. A very hard stone can still be brittle, glass scores 7 on the Mohs scale but chips easily under impact.

Moissanite is both hard and tough. It is resistant to the kind of incidental knocks that occur in rings and bracelets worn every day. It will not chip or crack under the forces of ordinary wear. Moissanite is considered suitable for all jewellery types including rings, where impact exposure is highest.

• Thermal Stability

Moissanite is thermally stable. It will not fracture or change colour under the heat applied in standard jewellery repair, resizing, or maintenance. This is relevant for rings in particular, where a jeweller may need to resize the band without removing the stone.

• Moissanite Colour Grading: D Through J and Beyond

Moissanite is graded for colour on a scale adapted from the diamond colour grading system, developed by the Gemological Institute of America. The scale runs from D (completely colourless) through Z (visibly yellow or brown). The most relevant grades for moissanite jewellery fall between D and J.

• Colourless Grades: D, E, and F

D, E, and F colour moissanite is colourless. Under all lighting conditions, daylight, warm indoor light, artificial overhead light, and flash photography, a D, E, or F stone shows no discernible warmth or tint. D is the highest grade. The difference between D and F is only detectable by a trained gemologist under laboratory conditions and is invisible in a finished jewellery setting.

Bellari uses D colour moissanite across its jewellery range, including the moissanite tennis bracelet collection, the earrings collection, the moissanite tennis necklace collection, and the rings collection.

• Near-Colourless Grades: G, H, and I

G, H, and I colour moissanite is near-colourless. Any warmth present in these stones is generally only visible when comparing them directly against a D colour stone under controlled conditions. In a finished jewellery piece worn in real-world lighting, near-colourless moissanite reads as essentially colourless to most observers.

Why Colour Grading Matters More in Multi-Stone Pieces

In a single-stone ring or stud earring, a slight warmth in the stone is harder to notice without a reference point. In a multi-stone piece, a tennis bracelet, a tennis necklace, a pavé setting, stones sit directly adjacent to each other and colour variation becomes visible across the line.

In Bellari's moissanite tennis bracelet, all stones are matched for colour before setting. This means the bracelet reads as a single continuous line of uniform light rather than a sequence of individual stones with visible variation between them. The same matching process applies to the Petal Pink moissanite tennis bracelet, where consistent pink colour across every stone is equally important to the finished piece.

Moissanite Cuts and How They Affect Light

The cut of a moissanite stone determines the geometry through which light enters and exits the pavilion. Different cuts produce different optical characters — different proportions of brilliance, fire, and scintillation. The cut also determines the stone's silhouette, which has significant aesthetic implications in the finished jewellery piece.

Bellari's moissanite studs earrings collection is available in five stone cuts, making it one of the broadest cut selections available from a single brand in the Australian moissanite market. Each cut produces a noticeably different result.

Round Brilliant Cut

The round brilliant cut is the most light-efficient cut available for any gemstone. It is designed specifically to maximise the return of white light through the crown. A round brilliant moissanite at D colour and VVS1 clarity produces the strongest, most uniform brilliance of any cut option.

The round brilliant is the standard cut used in Bellari's moissanite tennis bracelet and in the round stud option from the moissanite earrings collection. In a tennis bracelet, the round brilliant cut produces a consistent, even light return across the full length of the piece. Each stone contributes to the unified line without any one stone reading differently from its neighbours.

Oval Cut

The oval cut is a modified brilliant cut. It has the same number of facets as a round brilliant but arranged within an elongated shape. The oval cut produces a strong brilliance comparable to a round, but with added length across the stone that creates a different effect on the wrist or ear.

In an oval stud earring, the elongation makes the stone appear larger than a round of the same carat weight. The oval also shows more fire than the round brilliant due to the way light enters and refracts across the elongated pavilion. Bellari's oval moissanite stud earrings are D colour, VVS1 clarity, and set in rhodium-plated 925 sterling silver.

Emerald Cut

The emerald cut is a step cut rather than a brilliant cut. Where brilliant cuts use triangular and kite-shaped facets designed to reflect light back through the crown, the emerald cut uses long, parallel rectangular facets arranged in steps down from the table. This produces a very different optical effect.

An emerald cut moissanite shows less fire and brilliance than an oval or round, but produces a clear, mirror-like reflection through the table that is characteristic of step cuts. The stone shows its interior cleanly, this is sometimes called the "hall of mirrors" effect. The emerald cut is less forgiving of lower colour grades because the large open table makes colour more visible. D colour moissanite is particularly well suited to the emerald cut for this reason.

Bellari's emerald cut moissanite stud earrings are available at 1 carat. The emerald cut produces the most architectural and restrained look of any cut in the range, the stone reads as structured and geometric rather than brilliance-forward.

Pear Cut

The pear cut combines a rounded bottom with a pointed top, producing a teardrop silhouette. It is a modified brilliant cut that produces strong brilliance and fire, with a directional orientation that affects how the stone is set and worn.

A pear-cut moissanite stud earring is typically set with the point facing upward. The asymmetric silhouette is more distinctive than a round or oval and reads as a more considered aesthetic choice. The pear cut moissanite earrings is available in Bellari's earrings collection.

Radiant Cut

The radiant cut is a rectangular or square cut with trimmed corners and a brilliant-cut facet arrangement across the pavilion. It combines the geometric outline of a step cut with the light performance of a brilliant cut. The result is a stone that shows strong brilliance and fire within a structured rectangular silhouette.

The radiant cut produces a bolder, more modern aesthetic than the oval or round. It is available in Bellari's earrings collection alongside the four other cut options.

How Moissanite Compares to Diamond

Moissanite and diamond are different materials. Understanding the actual differences, rather than relying on approximations, makes it easier to evaluate both accurately.

Optical Character

Diamond is known for brilliance: the return of white light through the crown of the stone. Moissanite has a higher refractive index than diamond (2.65 to 2.69 versus 2.42) and a significantly higher dispersion rate (0.104 versus 0.044). This means moissanite returns more light overall and separates white light into colour more aggressively.

The practical result is that under point-source or direct lighting, moissanite shows more coloured fire than diamond. Under diffused or ambient lighting, overcast daylight, soft indoor lighting, the two stones can appear similar to the untrained eye. The most visible difference occurs in direct sunlight or under a spotlight.

Neither optical character is superior in an absolute sense. They are different. The preference for one over the other is a matter of taste.

Hardness

Diamond is 10 on the Mohs scale. Moissanite is 9.25. Both are highly resistant to surface scratching in daily wear. The 0.75-point difference has no practical effect on how either stone holds up in normal use. Only diamond can scratch moissanite, and that scenario does not arise in ordinary jewellery wearing.

Composition and Origin

Diamond is pure carbon. Moissanite is silicon carbide. They are chemically distinct materials. Diamond is found naturally (and is also grown in laboratories as lab-grown diamond). Moissanite used in jewellery is grown in laboratory conditions, as naturally occurring moissanite is too rare to source commercially.

How a Gemologist Tells Them Apart

Standard diamond testers measure thermal conductivity. Moissanite has thermal conductivity similar to diamond, which means basic testers may produce an inconclusive or false-positive reading for moissanite. A tester that measures both thermal and electrical conductivity will correctly distinguish the two stones. Visual distinction requires close comparison under controlled conditions and is not reliably achievable to the untrained eye in natural wear.

For a full side-by-side comparison across every property, the moissanite vs diamond guide covers this in detail.

How Moissanite Compares to Lab-Grown Diamond

Lab-grown diamond and moissanite are frequently confused or grouped together, but they are different materials.

Lab-grown diamond is chemically identical to mined diamond, it is pure carbon in a cubic crystal structure, grown in a laboratory using either high pressure and high temperature (HPHT) or chemical vapour deposition (CVD). It has the same hardness (10), the same refractive index (2.42), and the same dispersion rate (0.044) as a mined diamond. A lab-grown diamond is a diamond.

Moissanite is silicon carbide. It is not diamon, mined or laboratory-grown. It has different hardness (9.25), a higher refractive index, and a higher dispersion rate.

The practical differences for a buyer are in optical character, price, and availability. Lab-grown diamond has the optical character of diamon, strong brilliance, lower fire than moissanite. Moissanite has higher fire and higher brilliance by index measurement. Price points differ between the two, with moissanite generally more accessible at equivalent carat weights.

Both are produced in laboratories. Neither involves mining.

GRA Certification: What It Means for Moissanite

GRA stands for Gemological Research Association. A GRA certificate is a grading report issued specifically for moissanite that documents the stone's properties: carat weight, cut grade, colour grade, clarity grade, and proportions. Some GRA certificates also include a laser inscription on the stone's girdle that matches the certificate number.

A GRA certificate confirms that a stone is genuine moissanite, not cubic zirconia, synthetic spinel, or another simulant, and that its grading characteristics have been independently assessed.

GRA is not affiliated with GIA (Gemological Institute of America), which is the most widely recognised diamond grading authority. GRA is a moissanite-specific reporting body. When a seller refers to a GRA-certified moissanite, they are referring to this independent documentation of the stone's grade.

When buying moissanite jewellery, asking whether stones are accompanied by a grading report and what institution issued it provides a baseline of verification. Specific colour and clarity grades stated on the certificate should match what the seller has represented.

The Ethics and Sustainability of Moissanite

Because moissanite used in jewellery is grown in a laboratory, its production does not involve mining. No land is excavated. No communities are displaced. No mineral extraction supply chain is involved.

This matters for buyers who consider the environmental and social conditions of production when making purchasing decisions. Laboratory-grown moissanite has a clearly traceable production pathway, which is not always the case with mined gemstones.

The energy used to grow moissanite in a laboratory is a relevant consideration. Industrial processes require energy, and the source of that energy varies by manufacturer. Moissanite producers are not uniformly transparent about their energy sourcing. This is worth noting as a nuance rather than treating laboratory origin as automatically environmentally neutral.

Compared to mined gemstones, laboratory-grown moissanite does represent a significantly lower environmental disruption. It has no association with the conflict-mineral issues that have affected diamond supply chains at various points. For buyers for whom provenance and production conditions are a priority, moissanite's laboratory origin is a meaningful attribute.

Moissanite Across Different Jewellery Types

Moissanite is well suited to all major jewellery categories. Its hardness, optical properties, and chemical stability make it appropriate for any setting where a faceted gemstone is used.

Moissanite Tennis Bracelets

A moissanite tennis bracelet uses a continuous line of stones set in a flexible linked band. The round brilliant cut is the standard for this piece, as it produces the most consistent and uniform light return across the full length of the bracelet. Stone size (typically 2mm or 3mm), colour grade, and setting quality are the key variables.

Bellari's moissanite tennis bracelet collection is available in 2mm and 3mm in D colour, VVS1 clarity moissanite, set in rhodium-plated 925 sterling silver. The Petal Pink moissanite tennis bracelet is available in 3mm for those who prefer a coloured stone option. The tennis bracelet size guide covers how to measure for correct fit.

Moissanite Earrings

Stud earrings are the most common format for moissanite earrings. A stud places a single stone in a prong or bezel setting on a post. Different stone cuts produce distinctly different results on the ear — round and oval for brilliance-forward looks, emerald cut for a more architectural aesthetic, pear for directional asymmetry, radiant for a geometric profile.

Bellari's moissanite earrings collection covers all five cuts: oval, round, pear, radiant, and emerald cut. The oval moissanite stud earrings and emerald cut moissanite stud earrings are the two most distinct options in terms of light behaviour. All are set in rhodium-plated 925 sterling silver with D colour, VVS1 moissanite.

Moissanite Necklaces

A moissanite tennis necklace uses the same continuous-stone construction as a tennis bracelet, applied at the neckline. Stone size, colour matching, and setting quality carry the same importance as in a bracelet. Because a necklace drapes across the collarbones rather than bending around a joint, the articulation requirements are slightly different, but the core construction principles are the same.

Bellari's moissanite tennis necklace collection uses D colour, VVS1 round brilliant moissanite at the same standard as the bracelet range. The two pieces are designed to work together as a set. For bridal jewellery, the necklace and bracelet together as a paired set are covered in The Bridal Edit.

Moissanite Rings and Eternity Bands

An eternity band uses a continuous line of stones set around the circumference of a ring band. Like a tennis bracelet, colour matching across all stones is essential. The moissanite in an eternity band is set at a smaller scale than in a bracelet, which places greater importance on cut precision and stone-to-stone consistency.

Bellari's moissanite eternity band is available in both rhodium-plated 925 sterling silver and 10K solid gold — the only piece in the Bellari range currently offered in solid gold. The full rings collection covers both the eternity band and the eternity ring. For buyers comparing solid gold versus rhodium-plated sterling silver for a ring worn daily, the moissanite durability guide covers what to expect from each metal over time.

Common Misconceptions About Moissanite

Several widely repeated claims about moissanite are inaccurate. Understanding what is true and what is not makes it easier to evaluate moissanite objectively.

• Moissanite is a fake diamond. Incorrect. Moissanite is not a diamond simulant in the sense of being a lesser version of diamond. It is a distinct gemstone with its own chemical composition, hardness, and optical properties. Calling moissanite a fake diamond is similar to calling a sapphire a fake diamond, both are real gemstones, simply different ones.
• Moissanite turns cloudy over time. Incorrect. Moissanite does not cloud, fade, or change in optical quality with age. The silicon carbide crystal is chemically stable. A build-up of residue near the setting can make the stone appear temporarily less bright, but this clears with cleaning. The stone itself does not change.
• Moissanite scratches easily. Incorrect. At 9.25 on the Mohs scale, moissanite is one of the hardest gemstones used in jewellery. It is resistant to surface scratching from all materials encountered in everyday life.
• Moissanite always looks fake because of its fire. Partially inaccurate. Moissanite shows more coloured fire than diamond under direct lighting, which some observers associate with non-diamond stones. Under ambient or diffused lighting, the conditions in which most jewellery is worn most of the time,  the difference is far less pronounced. D colour, VVS1 moissanite in a well-made setting reads very similarly to high-grade diamond in most real-world environments.
• All moissanite is the same. Incorrect. Moissanite varies significantly in quality depending on colour grade, clarity grade, cut precision, and stone-to-stone matching. The difference between D colour VVS1 moissanite in a matched set and ungraded moissanite from an unspecified source is visible and meaningful.

How to Care for Moissanite Jewellery

Moissanite requires less maintenance than many gemstones. The stone itself is chemically stable and does not react to moisture, skin oils, or common household products in a way that causes permanent change.

The most effective routine maintenance is a gentle clean every two to three weeks for pieces worn daily. Warm water, a small amount of mild dish soap, and a soft-bristled brush are sufficient. Allow the piece to soak briefly, work the brush gently through the prongs and around the stone, rinse under clean running water, and pat dry with a soft cloth.

For pieces set in rhodium-plated sterling silver, avoid ultrasonic cleaners if the plating is already showing wear, and avoid abrasive polishing cloths on the metal surface. The rhodium layer can be professionally reapplied by a jeweller when needed — this is standard maintenance, not a repair.

Store moissanite jewellery separately from other pieces. Contact between stones and metal surfaces during storage causes unnecessary surface wear on both the pieces and their settings.

The Sparkle Guide at Bellari provides material-specific care guidance for each product type in the range. For a detailed account of what to expect across years of daily wear, the moissanite durability guide covers the stone, the setting, and the metal at each stage of ownership.

Buying Moissanite Jewellery in Australia

Moissanite jewellery is widely available in Australia from both specialised online retailers and physical jewellery stores. The Australian market has grown substantially in recent years, which means more choice but also more variation in quality.

When evaluating any moissanite piece in Australia, the questions to ask are the same regardless of retailer: what is the colour grade, what is the clarity grade, are stones matched before setting in multi-stone pieces, what is the metal construction, what is the clasp or setting type, and what are the return and warranty terms.

A seller who can answer these questions with specific grades and specifications is more reliably sourcing quality stones than one who uses general descriptors. Specific grades are verifiable standards. "High quality moissanite" without further specification is not.

Bellari's full collection covers the complete range of moissanite jewellery available from the brand — tennis bracelets, tennis necklaces, stud earrings in five cuts, eternity bands, and eternity rings. All products list their specifications, including stone grade and metal construction.

Further reference content on moissanite, buying guides, care, comparisons, and stone education, is published in The Edit, Bellari's journal of jewellery reference content.

Final Thoughts

Moissanite is silicon carbide: a real gemstone first identified in meteorite material in 1893 and grown in laboratory conditions for commercial use since the 1990s. It has a Mohs hardness of 9.25, a refractive index of 2.65 to 2.69 (higher than diamond), and a dispersion rate of 0.104 (more than twice that of diamond).

It is graded for colour from D (colourless) through warmer tones, and for clarity from flawless through included grades. D colour, VVS1 clarity round brilliant moissanite is the standard used in Bellari's jewellery range. Cut significantly affects the stone's optical character, round brilliant for maximum light return, oval and radiant for brilliance within different silhouettes, emerald cut for a step-cut architectural look, pear for directional asymmetry.

Moissanite does not cloud, scratch, or degrade in optical quality with age. It is chemically stable, thermally resistant, hypoallergenic in most metal settings, and produced without mining. It is a distinct gemstone from diamond, not a substitute for it. Understanding what it is makes it easier to buy, care for, and appreciate accurately.