Moissanite Jewellery Guide

Moissanite jewellery is valued for exceptional sparkle, high scratch resistance and the ability to create elegant jewellery with a strong visual presence. But moissanite is often misunderstood. It is not a diamond, it is not cubic zirconia, and the moissanite used in modern jewellery is generally a laboratory-created form of silicon carbide with its own distinct optical and physical properties.

Understanding those differences is important when comparing rings, necklaces, earrings and bracelets. Terms such as carat, colourless, VVS and diamond equivalent can also be confusing when they are borrowed from diamond terminology and applied to another gemstone.

This expert Aurum & Relics guide explains what moissanite really is, how it differs from diamond and cubic zirconia, how to judge quality, what its optical properties mean in real jewellery, how to choose the right setting and how to care for moissanite correctly.

Browse our Moissanite Jewellery collection for current designs.

What Is Moissanite?

Moissanite is the mineral name associated with silicon carbide, chemically written as SiC.

Natural moissanite exists, but it is extremely rare. Natural silicon carbide has been identified in meteorites and in a small number of terrestrial geological environments, generally as very small crystals.

The faceted moissanite used commercially in modern jewellery is therefore normally synthetic or laboratory-created moissanite.

This distinction is important. Laboratory-created moissanite has the chemical composition and crystal structure of synthetic silicon carbide. It is not glass or cubic zirconia, but neither is it a laboratory-grown diamond.

A Short History of Moissanite

The name moissanite honours French scientist and Nobel laureate Henri Moissan. Silicon carbide associated with meteorite material became an important part of the mineral’s early scientific history, while later developments in crystal-growth technology made gem-quality synthetic moissanite possible.

By the late twentieth century, near-colourless synthetic moissanite had become commercially viable for jewellery and attracted attention because several of its properties place it unusually close to diamond in appearance while still making it readily identifiable as a different material.

Why Does Moissanite Sparkle So Much?

Sparkle is not a single gemmological property. When looking at a faceted gemstone, several optical effects contribute to what the eye sees.

Brilliance

Brilliance refers broadly to the return of white light from a faceted gemstone.

Moissanite has a high refractive index. Gemmological measurements reported by the Gemological Institute of America for synthetic moissanite place its refractive indices at approximately 2.65–2.69.

This contributes to its strong brightness when a stone is cut effectively.

Fire

Fire is the separation of white light into spectral colours.

Moissanite has particularly high dispersion. This is why red, blue, green and other coloured flashes may be more obvious in moissanite than in a diamond under certain lighting conditions.

GIA notes that moissanite can display more than twice the fire of diamond.

Double Refraction

One of moissanite’s important gemmological characteristics is double refraction.

Light travelling through the stone can divide into two rays. Depending on orientation and cutting, this can make some internal facet junctions appear doubled when examined closely.

Diamond, by comparison, is singly refractive.

How Durable Is Moissanite?

Moissanite is approximately 9.25 on the Mohs hardness scale, compared with 10 for diamond.

That makes it highly resistant to scratching and particularly practical for jewellery intended for regular wear.

However, one important expert distinction is often overlooked:

Even a very hard gemstone should therefore be removed before heavy manual work, impact sports or activities that could damage the metal setting.

Moissanite vs Diamond: What Is the Real Difference?

Moissanite and diamond may both produce strong sparkle, but they are fundamentally different materials.

Is Moissanite a Lab-Grown Diamond?

No.

This is one of the most important distinctions when buying moissanite jewellery.

A laboratory-grown diamond is diamond: it has a carbon crystal structure closely corresponding to natural diamond.

Moissanite is silicon carbide and has different optical, chemical and physical properties.

It should therefore be sold and described clearly as moissanite, not as diamond.

Does Moissanite Look Exactly Like Diamond?

Not exactly.

High-quality colourless or near-colourless moissanite can create a superficially diamond-like appearance, but experienced observers may notice its stronger rainbow fire and, under magnification, optical effects associated with double refraction.

These differences are not defects. They are characteristics of moissanite itself.

Moissanite vs Cubic Zirconia

Moissanite and cubic zirconia are sometimes grouped together because both can be used as diamond simulants, but the two are very different materials.

Cubic zirconia is synthetic zirconium oxide and has a Mohs hardness of approximately 8.5. Moissanite is silicon carbide and is harder at approximately 9.25.

They also differ in density, refractive behaviour, brilliance, fire and long-term wear characteristics.

How to Judge the Quality of Moissanite Jewellery

Judging moissanite jewellery requires looking at more than a single colour or clarity label.

A well-chosen piece should be assessed as a complete combination of stone, cut, setting, metal, construction and disclosure.

1. Cut and Proportions

Cut has an enormous influence on appearance.

Facets determine how light enters, travels through and leaves the stone. Poor proportions can reduce visual performance even when the underlying material is good.

Look for:

• symmetrical faceting;
• an even outline;
• good centring within the setting;
• balanced brightness across the face of the stone;
• secure and evenly positioned prongs or bezels.

2. Colour

Moissanite can range from colourless and near-colourless to intentionally coloured material.

Some stones can reveal subtle yellow, greenish or grey tones under particular lighting or viewing angles.

Colour preference is subjective. What matters is that the product description accurately represents the stone being sold.

3. Clarity

Laboratory-created moissanite can contain internal characteristics, although many jewellery-grade stones appear very clean without magnification.

Be cautious when seeing diamond-style clarity terminology such as VVS1 attached to moissanite.

The familiar FL–I3 clarity system is fundamentally associated with diamond grading. Unless a seller identifies the grading organisation and standard used, a label such as “VVS” should not automatically be interpreted as an independent GIA moissanite grade.

Moissanite Carat Weight vs Stone Size

This is another area where jewellery descriptions can become confusing.

A carat is a unit of mass, not a measurement of diameter.

Moissanite and diamond do not have the same density. Moissanite has a lower specific gravity than diamond, which means stones with similar face-up dimensions do not necessarily have the same carat weight.

For this reason, some moissanite sellers use expressions such as diamond equivalent weight or DEW.

When comparing stones, it is often more useful to check the actual dimensions in millimetres.

For example, instead of relying only on a “1 carat equivalent” description, check the stone’s:

• diameter;
• length and width;
• depth where supplied;
• actual weight where relevant;
• whether the stated carat figure represents actual weight or diamond-equivalent size.

How Is Moissanite Identified?

Moissanite can be distinguished from diamond using appropriate gemmological testing.

Professional identification can consider properties such as:

• double refraction;
• refractive behaviour;
• specific gravity;
• electrical conductivity;
• spectroscopic response;
• microscopic characteristics.

Can a Diamond Tester Detect Moissanite?

This depends on the tester.

Older or simple testers based predominantly on thermal conductivity can produce misleading results because moissanite’s thermal properties are unusually similar to diamond.

GIA’s early research into synthetic moissanite found conventional thermal probes could register the material as diamond.

Modern instruments designed to distinguish diamond and moissanite use additional testing principles.

Popular Moissanite Cuts and Shapes

Moissanite can be fashioned into many of the shapes familiar from diamond jewellery.

Round Brilliant

Round brilliant cuts are designed to produce intense light return and are a natural match for moissanite’s strong brilliance and fire.

Oval

Oval shapes create an elongated appearance and can give a larger face-up impression relative to some other cuts.

Emerald Cut

Emerald cuts use long step facets rather than the dense brilliant-style faceting of a round stone.

The result is usually a calmer, more architectural pattern of light.

Cushion

Cushion shapes combine a square or rectangular outline with softened corners and work well in solitaire and halo designs.

Pear

Pear shapes combine rounded and pointed geometry and can be particularly effective in pendants and drop earrings.

Heart

Heart-shaped stones require good symmetry for a balanced appearance and are particularly popular in meaningful gift jewellery.

Choosing the Right Metal and Setting

A gemstone is only one part of a piece of jewellery. The metal and construction surrounding it determine comfort, durability and appearance.

Sterling Silver

Sterling silver provides a bright white-metal appearance that pairs naturally with colourless and near-colourless moissanite.

Remember that sterling silver can tarnish naturally and requires appropriate care.

Explore our Silver Jewellery collection or read our Silver Jewellery Guide .

White Gold and Platinum

White precious metals create a cool-toned appearance and are commonly chosen where a bright, neutral setting is desired.

Yellow Gold

Yellow gold provides a warmer contrast against a colourless stone and can give moissanite jewellery a more traditional appearance.

Rose Gold

Rose-toned metals create warmer colour contrast and can soften the appearance of highly brilliant stones.

Prong, Bezel and Halo Settings

Prong Setting

Prongs hold the gemstone at several points while leaving much of the stone exposed to light.

They should be checked periodically because a loose or damaged prong can place the gemstone at risk regardless of how hard the stone itself is.

Bezel Setting

A bezel surrounds more of the stone’s edge with metal and can provide additional physical protection, particularly for jewellery worn frequently.

Halo Setting

A halo surrounds the centre stone with smaller stones, creating greater visual surface area and sparkle.

Is Moissanite Suitable for Everyday Wear?

Its high scratch resistance makes moissanite an excellent candidate for jewellery worn regularly.

It is commonly used in:

• rings;
• pendants;
• stud earrings;
• drop earrings;
• bracelets;
• bridal jewellery.

However, everyday durability depends on the whole piece, not just the gemstone.

A stone may be hard while a thin prong, chain, clasp or plated surface remains vulnerable to damage.

Moissanite Engagement Rings

Moissanite is frequently chosen for engagement-style rings because of its brilliance and high resistance to scratching.

When choosing a ring intended for long-term regular wear, pay particular attention to:

• security of the centre-stone setting;
• band thickness;
• prong construction;
• whether the ring size is fixed or adjustable;
• metal composition;
• whether the finish is solid metal or plated;
• availability and terms of any gemstone report.

Browse our Rings collection for additional styles.

Moissanite Necklaces and Earrings

A pendant or stud earring generally experiences less impact than a ring worn on the hand, making these formats particularly practical for showcasing highly brilliant stones.

Explore: Necklaces and Earrings.

Moissanite Bracelets

Bracelets can produce an impressive line of brilliance, particularly in tennis-style designs.

Because bracelets regularly contact desks, clothing and other surfaces, clasp quality, link construction and secure stone setting are particularly important.

Browse our Bracelets collection .

Is Moissanite an Ethical or Sustainable Choice?

This question deserves a more careful answer than simply saying “yes”.

Commercial moissanite is laboratory-created, so producing the gemstone itself does not require mining natural moissanite deposits.

However, the environmental footprint of a finished piece of jewellery can also depend on:

• energy used in crystal production;
• energy source;
• metal mining and refining;
• plating processes;
• manufacturing location;
• packaging;
• transport.

For that reason, broad claims such as “completely sustainable” or “environmentally harmless” should be treated cautiously unless supported by specific evidence.

A more accurate advantage is that gem-quality commercial moissanite has a known laboratory origin rather than being extracted as a naturally mined gemstone.

How to Clean Moissanite Jewellery

Moissanite itself is highly durable, but cleaning should always consider the metal, plating, other stones and construction of the entire piece.

For many uncomplicated moissanite pieces, gentle cleaning can be carried out using:

1. lukewarm water;
2. a small amount of mild soap;
3. a very soft brush where appropriate;
4. clean water for rinsing;
5. a soft lint-free cloth for drying.

Avoid aggressive scrubbing around delicate prongs or pavé settings.

What Should You Avoid?

• bleach;
• strong household chemicals;
• abrasive powders;
• hard brushes;
• unnecessary impact;
• cleaning products not suitable for the setting metal;
• chemical dips intended for a different jewellery material.

Can Moissanite Go in an Ultrasonic Cleaner?

Moissanite itself is generally considered suitable for ultrasonic cleaning, but that does not mean every piece of moissanite jewellery should automatically go into an ultrasonic cleaner.

The setting may contain delicate pavé work, another gemstone, plating, adhesive-set components or existing loose stones.

When the complete construction is uncertain, gentle manual cleaning is the safer default.

See our complete Jewellery Care Guide for further guidance.

Does Moissanite Become Cloudy?

Moissanite does not normally develop permanent internal cloudiness simply through ordinary wear.

However, a stone can look dull or cloudy when oils, soap residue, cosmetics and everyday deposits build up on the surface or underneath the setting.

Cleaning the stone correctly usually restores its optical performance if surface contamination is the cause.

Persistent changes should be inspected professionally rather than assuming the gemstone itself has altered.

How to Store Moissanite Jewellery

Because moissanite is very hard, it can scratch softer jewellery materials stored beside it.

For this reason:

• store pieces separately;
• use individual compartments or soft pouches;
• keep necklaces fastened to reduce tangling;
• avoid placing moissanite directly against pearls or softer gemstones;
• keep jewellery clean and dry before long-term storage.

Moissanite Jewellery Buying Checklist

Moissanite Jewellery FAQs

Is moissanite a real gemstone?

Yes. Moissanite is a genuine gemstone material composed of silicon carbide. Natural moissanite is extremely rare, while the gem-quality material used commercially is normally laboratory-created.

Is moissanite a diamond?

No. Moissanite and diamond have different chemical compositions and crystal structures. Moissanite is silicon carbide; diamond is carbon.

Is moissanite the same as a lab-grown diamond?

No. A laboratory-grown diamond has essentially the same carbon crystal structure as a natural diamond. Laboratory-created moissanite is synthetic silicon carbide.

Is moissanite the same as cubic zirconia?

No. Cubic zirconia and moissanite are different manufactured gemstone materials with different composition, hardness, density and optical behaviour.

How hard is moissanite?

Moissanite has a Mohs hardness of approximately 9.25, giving it excellent resistance to scratching.

Does moissanite sparkle more than diamond?

Moissanite displays particularly strong fire — the coloured spectral flashes seen when white light is dispersed. GIA describes its fire as more than twice that of diamond, although the overall visual appearance of the two gemstones is different.

Why can moissanite show rainbow flashes?

Its high dispersion separates white light strongly into spectral colours. Those red, blue, green and other flashes are a normal optical characteristic of moissanite.

Can a diamond tester identify moissanite incorrectly?

Some simple thermal-conductivity diamond testers can react to moissanite in a way that resembles diamond. Modern identification requires equipment or testing methods capable of distinguishing the two materials.

What does D colour VVS1 mean on moissanite?

These terms are borrowed from diamond-style grading language and may be used commercially by moissanite manufacturers or laboratories. Always check which organisation issued the grade and what grading standard was used rather than assuming it represents a GIA diamond grade.

Is moissanite good for everyday jewellery?

Its high scratch resistance makes it well suited to regular wear, but the security and durability of the complete piece also depend on the metal, setting, prongs, chain or clasp.

Can moissanite become cloudy?

Surface deposits from oils, soap and cosmetics can make a stone appear dull, but this should not be confused automatically with permanent internal cloudiness.

How should moissanite be cleaned?

For many pieces, lukewarm water, mild soap and gentle cleaning with a soft brush or cloth are sufficient. Always consider the setting metal, plating and any additional gemstones before choosing a cleaning method.