What Is Moissanite? A Complete Guide to This Diamond Alternative
If you've started shopping for engagement rings or fine jewelry, you've probably come across a stone that looks remarkably similar to diamond but costs considerably less: moissanite.
So, what is moissanite? Moissanite is a gemstone made of silicon carbide (SiC). It is not a diamond, although its brilliance, durability, and appearance have made it one of the most popular diamond alternatives in jewelry today.
Natural moissanite is extraordinarily rare, first found in a meteorite crater, not a jewelry store, so the moissanite used in modern jewelry is almost always laboratory-grown, produced without mining.
Moissanite doesn't just resemble diamond; it's an entirely different gemstone, with its own chemistry, hardness, and optical fingerprint. Below, we'll cover how it compares to both mined and lab-grown diamond, what it costs, how durable it really is, and whether it makes sense for your own jewelry.

How Was Moissanite Invented?
In 1893, French chemist Henri Moissan was examining rock samples from a meteorite that had struck Canyon Diablo in Arizona. Under his microscope, he found tiny, glittering crystals he initially believed were diamonds.
Further analysis revealed something else entirely: the crystals were made of silicon carbide, a compound that had never before been found in nature. Moissan had discovered a new mineral, and it would later be named moissanite in his honor.
(If you're wondering how to say it: moissanite is pronounced MOY-suh-nite.)
Is Moissanite a Real Diamond?
No, moissanite is not a real diamond, but it is a real gemstone. Natural moissanites are very rare, so most moissanite is created in a lab. Lab-created moissanite is also real because it's made by replicating the same process that occurs in nature, and the final product contains the same chemical structure; the only difference is that it's made quickly in the lab.
What Is Moissanite Made Of?
Moissanite is made of silicon carbide. Silicon carbide is a compound of silicon and carbon. Moissanite’s chemical composition is different from diamond, which is made entirely of carbon.
|
Moissanite |
Diamond |
|
|
Chemical composition |
Silicon carbide (SiC) |
Carbon |
|
Natural occurrence |
Extremely rare |
Naturally occurring |
|
Modern jewelry stones |
Lab-created |
Natural or lab-grown |
|
Mohs hardness |
~9.25 |
10 |
|
Optical character |
High brilliance, strong fire (dispersion ~0.104) |
High brilliance, lower fire (dispersion ~0.044) |
|
Double refraction |
Yes |
No |
|
Mining required |
No |
Yes for natural diamond (lab-grown diamond also requires none) |
|
Is it a diamond? |
No |
Yes |
Moissanite is sometimes referred to as a diamond stimulant, but it is not a fake diamond or fake gemstone. It is a different gemstone altogether with its own physical, chemical, and optical properties.
Why Does Moissanite Look Like Diamond?

Moissanite looks like diamond because it returns light in almost the same way diamond does and, in one respect, it goes even further. Both stones have high refractive index, meaning they bend light sharply and bounce a large share of it straight back to your eye.
But moissanite doesn't stop at brilliance; it has a fire as well. Fire is the flashes of spectral color, reds and blues and greens, that appear when a stone splits white light apart, and moissanite's fire is stronger than diamond's.
Its dispersion sits around 0.104, well above diamond's, so in larger stones especially, you get rainbow flashes that diamond doesn't produce at the same intensity.
Why Does Moissanite Sometimes Look Different From Diamond?

Diamond is singly refractive, meaning light passes through it along one path. Moissanite is doubly refractive, meaning light entering the stone splits into two separate paths as it travels through.
You don't need to understand the physics to notice the effect. Under the right viewing conditions, especially when looking straight through the stone toward its back facets. This doubling can give moissanite a slightly different visual character than diamond.
In everyday jewelry shopping, it's rarely something you'd notice or need to think about. But it's a useful detail once you're trying to understand why two stones that look so similar at a glance aren't actually optically identical.
Is Moissanite Durable Enough for Everyday Wear?
Yes. Moissanite is hard enough for everyday jewelry and can be chosen for engagement rings and other pieces meant to be worn constantly. Its Mohs hardness is about 9.25, just below diamond's 10. So it is slightly less hard than diamond.
But here's the important distinction: the Mohs scale only measures resistance to scratching; it doesn't measure overall durability. Hardness alone doesn't decide whether a gemstone survives everyday life. It’s cut, setting, prong thickness, daily exposure, and how you actually wear the piece all play a role too.
How Much Does Moissanite Cost, and What About Resale Value?
Because most moissanites are lab-created, it doesn't carry the same scarcity or extraction costs that natural diamonds do. There's no mining, no sorting through tons of rock for a handful of gem-quality stones, and no matching a wildly variable natural supply to demand.
Moissanite production is more consistent and controllable, and that difference in supply chain is a major reason it costs a fraction of what a comparably sized diamond does, often somewhere in the range of a tenth to a twentieth of the price, depending on the specific stones being compared.
What Drives the Price
As covered earlier, moissanite pricing isn't a simple carat-based calculation. Cut quality, color grade, shape, size, and even brand all factor in. Two moissanite stones of identical carat weight can carry noticeably different price tags depending on how well they're cut and how colorless they are.
Resale Value: The Part Worth Being Honest About
Diamonds have an established resale and secondary market, even if it's an imperfect one where stones resell for well below their original purchase price. Moissanite's resale market is much thinner.
Because it's inexpensive to buy new, there's little financial incentive for buyers to seek out a used stone, and moissanite doesn't carry the same investment narrative that diamond has built up over the past century.
In practice, this means you should think of moissanite as a purchase for enjoyment and everyday wear, not as an asset with meaningful resale value. If long-term resale is genuinely a priority for you, that's one of the legitimate reasons to lean toward diamond instead, as mentioned earlier.
Moissanite vs. Lab-Grown Diamond
It's worth a quick note that lab-grown diamond is a different comparison from the moissanite-vs-diamond discussion above. Lab-grown diamond is chemically identical to mined diamond; it's pure carbon, graded the same way, while moissanite remains its own gemstone, silicon carbide, with its own hardness and fire. The two also sit at different price points, with that gap shifting as lab-grown diamond production has scaled up.
That comparison deserves its own space to do it justice; see our full [Moissanite vs. Lab-Grown Diamond guide] for a detailed breakdown of price, durability, and how to decide between them.
Is Moissanite an Ethical or Sustainable Choice?
Because lab-created moissanite doesn't require mining, it avoids the land disruption, water use, and sourcing concerns historically associated with diamond extraction. It's also conflict-free by nature, since there's no supply chain tied to mined-stone origin concerns.
This doesn't automatically make moissanite "more ethical" than lab-grown diamond, which is also produced without mining and is widely considered a responsibly sourced option in its own right.
But compared with mined diamond specifically, moissanite's production process is generally considered lower-impact, largely because growing silicon carbide requires less energy than the extreme heat and pressure needed to grow diamond crystals.
If ethical sourcing is a priority for you, both moissanite and lab-grown diamond are reasonable choices; the deciding factor at that point usually comes back to price, hardness, and whether you want the stone to be diamond specifically.
What Should You Look for When Buying Moissanite?
Now that you understand what moissanite actually is, it's clear this is an absolutely buyable gemstone for jewelry; it offers nearly the same look and almost the same durability as diamond. But choosing it well means paying attention to a few things beyond just the appearance.
Pay Attention to Cut
Cut has more influence over how a gemstone handles light than almost anything else. A poorly cut moissanite can look dull even though the material itself has impressive optical properties, while a well-cut stone looks lively, bright, and balanced. Don't let the material do all the selling; the cut is what actually brings it to life.
Consider Color
Moissanite color ranges from colorless to noticeably warmer tones, so it's worth thinking about how that color will look against your jewelry metal.
Think About Size
A bigger moissanite isn't just a scaled-up version of the same look. As the stone grows, its fire and overall optical character tend to become more visible. That's a bonus if you want a dramatic, colorful display. But if you're after a quieter, more diamond-like appearance, a size and cut that keep those effects restrained will serve you better.
Look at the Jewelry, Not Just the Stone
Even a beautiful gemstone can't make up for poor construction. Check the setting, prongs, symmetry, finish, metal quality, and overall workmanship.
Understand What You're Paying For
Moissanite pricing doesn't break down into a simple "carat price" the way diamond pricing often does. Size, cut, color, shape, quality, manufacturing, brand, and setting all factor into the final price.
Are There Reasons Not to Choose Moissanite?
Absolutely. Moissanite may not be the right choice if:
-
You specifically want a diamond, not a diamond alternative.
-
You prefer diamond's particular optical character, its balance of sparkle and fire.
-
You're not drawn to pronounced rainbow flashes.
-
The rarity and geological origin of a natural gemstone matter to you.
-
You're buying a piece where diamond's traditional identity carries personal meaning.
-
You care more about long-term resale value than the enjoyment and everyday use of the jewelry.
None of this makes moissanite a lesser gemstone. It's simply a reminder that the "best" gemstone depends on what you're actually buying it for. A ring can be beautiful, durable, and affordable, and still not be the right ring for you.
Is Moissanite a Good Choice for an Engagement Ring?
For many people, yes. Its combination of high brilliance, strong fire, 9.25 Mohs hardness, and ready lab availability makes it well suited to engagement-ring use.
But the better question isn't simply "Is moissanite good for an engagement ring?" It's this: What do you want your engagement ring to represent, and what do you want the stone to look like when you wear it every day?
If you love a bright stone with immense rainbow fire, with an affordable price, moissanite can make a lot of sense. But if the tradition, rarity, or personal symbolism associated with diamond, moissanite won't replace that, no matter how visually similar it is.
How Do You Clean Moissanite Jewelry?
Moissanite is easy to care for; for routine cleaning, warm water, mild soap, and a soft brush are usually enough to remove the oils and residue that build up from regular wear.
The setting deserves just as much attention as the stone itself. Dirt tends to collect around prongs and underneath the gemstone, and when it does, it can block light from reaching the stone and dull its sparkle.
It's also worth following the jewelry manufacturer's specific care instructions, especially if the piece includes additional gemstones, delicate details, or specialized finishes. The stone itself may be hard, but the ring as a whole still needs sensible, regular care.
