What Is Moissanite? Your Complete Guide
Moissanite is one of the most brilliant gemstones used in modern jewellery, yet many people still ask the same question: what is moissanite, and how does it compare with diamond? Moissanite is a gemstone made from silicon carbide, known for its intense sparkle, high durability and diamond-like appearance. It is not a diamond imitation, but a distinct gemstone with its own composition, optical properties and history.
Today, moissanite is especially popular in engagement rings and fine jewellery because it combines exceptional brilliance with everyday durability and a significantly lower price than many diamonds. For buyers who care about sparkle, stone size and overall design, moissanite can offer a very different kind of value.
What Is Moissanite and Where Does It Come From?
Moissanite is made from silicon carbide, also known as SiC. Its story began in 1893, when French chemist Henri Moissan discovered tiny crystals while examining material from a meteorite crater in Arizona. The crystals first appeared similar to diamond, but were later identified as silicon carbide. The mineral was eventually named moissanite after Moissan.
Natural moissanite is extraordinarily rare and occurs only in very limited geological and extraterrestrial environments. For that reason, virtually all moissanite used in jewellery today is created in laboratories. Lab-created moissanite makes it possible to produce stones in consistent sizes, cuts and quality levels suitable for modern jewellery without relying on traditional gemstone mining.
Moissanite is used in everything from earrings and necklaces to moissanite rings and engagement rings, where its brilliance and durability make it especially attractive.
Why Is Moissanite So Brilliant?
One of the defining characteristics of moissanite is the way it interacts with light. Its refractive index is approximately 2.65 to 2.69, compared with around 2.42 for diamond. This means moissanite bends light very strongly, contributing to its bright, lively appearance.
Moissanite also displays strong fire, meaning flashes of spectral color can appear as the stone moves under light. In bright conditions, especially with larger stones, these rainbow-like reflections can be particularly noticeable. Diamond creates a different type of brilliance, with a more traditional balance of white light and colored flashes.
This is one reason moissanite and diamond can look similar at first glance while still having a different visual character. Some people prefer the classic appearance of diamond, while others are drawn to the stronger fire and more expressive sparkle of moissanite.
Read our complete moissanite vs diamond comparison.
How Durable Is Moissanite?
Moissanite ranks approximately 9.25 on the Mohs hardness scale, compared with 10 for diamond. That makes it one of the hardest gemstones commonly used in jewellery and highly suitable for regular wear.
For engagement rings, this matters because the stone is often worn every day. Diamond is harder, but moissanite still offers excellent resistance to scratching and enough durability for jewellery intended to last for many years. This combination of hardness and brilliance is one of the main reasons moissanite has become such a popular choice for engagement rings.
Is Moissanite a Fake Diamond?
No. Moissanite is not a fake diamond. It is a separate gemstone made from silicon carbide, while diamond is made from carbon. The two materials have different chemical compositions, optical properties and origins.
They can look similar because both are transparent, highly brilliant gemstones and can be cut into many of the same shapes, including round, oval, cushion, emerald and marquise. At a normal viewing distance, many people may find it difficult to distinguish them immediately, but moissanite typically produces stronger colored flashes.
Moissanite should therefore be judged as a gemstone in its own right rather than as an imitation. It has its own advantages, especially for buyers who value high brilliance, durability and a larger visual presence at a lower price.
Why Is Moissanite Cheaper Than Diamond?
Moissanite generally costs significantly less than a natural diamond of a comparable visual size. The lower price does not mean the stone is soft or low quality. It is simply a different gemstone with a different production process, supply structure and market.
This price difference gives buyers more flexibility. Instead of spending most of the budget on the center stone, it may be possible to choose a larger moissanite, a more detailed setting or a more distinctive design. For many people, this makes moissanite especially attractive for engagement rings where visual impact matters.
Moissanite is also generally less expensive than lab-grown diamond of a comparable visual size. A lab-grown diamond is chemically and physically a diamond, while moissanite is silicon carbide, so the two should not be treated as the same type of stone.
Is Moissanite Good for Engagement Rings?
Yes. Moissanite is particularly well suited to engagement rings because it combines high hardness, strong brilliance and everyday durability. It can also be cut into many classic and modern shapes, which gives buyers considerable freedom when choosing a ring design.
Its lower price compared with diamond can make larger center stones and more elaborate settings more accessible. This is why moissanite engagement rings are increasingly chosen by people who want a durable, brilliant stone without paying the premium associated with a natural diamond of similar visual size.
Explore LunNoire moissanite engagement rings
Moissanite, Ethics and Certification
Jewellery-grade moissanite is lab-created and does not require traditional gemstone mining. For buyers who prefer a stone without a mined origin, this can be an important consideration. It is still worth remembering that terms such as ethical and environmentally friendly cover many different factors, including energy use, manufacturing conditions and supply chains.
Some moissanite stones are supplied with GRA grading reports that list characteristics such as measurements, color, clarity and cut information. Where GRA certification is included with a LunNoire piece, this is stated on the individual product page. Always check the specific product description to see exactly what documentation accompanies the jewellery.
Is Moissanite Worth It?
For someone who values brilliance, durability and visual impact, moissanite offers a compelling combination of qualities. It is not valuable because it imitates diamond. Its appeal comes from what it offers as a gemstone in its own right.
Moissanite gives buyers the freedom to focus on the overall appearance of the jewellery, including stone size, cut and setting, without being limited by diamond pricing to the same extent. Whether you prefer a classic solitaire or a more expressive design, moissanite can provide a bright, durable and distinctive result.
When choosing moissanite jewellery, consider the stone's cut, size, color grade, setting and metal. Cut is particularly important because it influences how effectively the stone reflects light and how its brilliance appears in everyday conditions.