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A simulated diamond is any gemstone or material that looks like a diamond but is not one. Unlike natural or lab-grown diamonds — both of which are made of carbon — simulated diamonds have a completely different chemical composition and crystal structure. The most common examples are cubic zirconia, moissanite, and white sapphire.
That’s the short answer. But if you’re trying to figure out whether a simulated diamond makes sense for your engagement ring, travel jewelry, or everyday wear, you need a lot more than that.
This guide covers what simulated diamonds are made of, how they compare to lab-grown diamonds (this is where most people go wrong), which simulants are actually worth buying, what they’re worth on the resale market, and whether they belong on your finger at all.
The Difference Between Simulants, Lab-Grown, and Natural Diamonds
Before anything else, let’s clear up the single biggest source of confusion in this category.
| Type | Looks Like a Diamond | Is a Real Diamond | Made of Carbon |
|---|---|---|---|
| Natural Diamond | Yes | Yes | Yes |
| Lab-Grown Diamond | Yes | Yes | Yes |
| Simulated Diamond | Yes | No | No |
Natural diamonds form underground over billions of years under intense heat and pressure. Lab-grown diamonds are created in controlled environments using high-pressure high-temperature (HPHT) or chemical vapor deposition (CVD) processes — but they have the exact same carbon crystal structure as natural diamonds. A diamond tester will confirm both as real diamonds.
Simulated diamonds are neither. They’re made from entirely different materials, they have different optical properties, and they will not pass a standard diamond tester.
One of the most common mistakes buyers make is assuming “lab-grown” and “simulated” mean the same thing. They don’t, and confusing the two can lead to paying simulated-diamond prices expecting lab-diamond quality — or vice versa.
Are Simulated Diamonds Real?
This question comes up constantly, and the answer needs to be precise.
Are simulated diamonds real diamonds? No. A simulated diamond is not a real diamond because it doesn’t share the chemical composition (carbon) or crystal structure (cubic crystalline form) of a diamond. No matter how convincing it looks, it will test as a non-diamond under professional grading conditions.
Are simulated diamonds real gemstones? That depends on the material. Moissanite is a real mineral — silicon carbide — that exists naturally (though most moissanite jewelry uses lab-created versions). White sapphire is a real corundum gemstone. Cubic zirconia is a real crystalline material synthesized in labs. Glass is just glass.
So the accurate answer is: simulated diamonds are real physical materials, and some are genuine gemstones. They simply are not diamonds.
This distinction matters for a practical reason. If you buy a moissanite ring marketed as a diamond simulant, you own a real gemstone with genuine optical properties. If you buy a glass simulant from an unscrupulous seller marketing it as something more valuable, you’ve been misled. The word “simulated” describes the diamond-like appearance, not the quality or legitimacy of the material itself.
What Are Simulated Diamonds Made Of?
Different simulants use very different materials. Here’s what’s actually inside the most common ones.
Cubic Zirconia (CZ)
CZ is made from zirconium dioxide, a synthetic crystalline material that doesn’t occur naturally in the form used for jewelry. It’s the most widely produced diamond simulant in the world, primarily because it’s extraordinarily cheap to manufacture at scale.
CZ is optically impressive when new — it has a high refractive index and disperses light into rainbow flashes (called fire) that some people actually find more visually dramatic than diamond. The problem is durability. With a Mohs hardness of 8–8.5, CZ scratches more easily than diamond, and over time it develops a cloudy, worn appearance. Most CZ rings look noticeably different after two or three years of daily wear.
Moissanite
Moissanite is silicon carbide. It was first discovered in 1893 in a meteor crater by chemist Henri Moissan, who initially mistook it for diamonds. Natural moissanite is extraordinarily rare — essentially all moissanite on the jewelry market is lab-created.
Moissanite sits at 9.25 on the Mohs scale, making it significantly harder than CZ and harder than almost every other gemstone except diamond (which is a 10). It has a higher refractive index than diamond, which gives it more sparkle, and a higher dispersion, which gives it more fire. Some buyers love this. Others find the fire slightly excessive compared to the subtler brilliance of a well-cut diamond.
Moissanite is the most durable, long-lasting, and optically impressive of all the common diamond simulants.
White Sapphire
White sapphire is colorless corundum — the same mineral family as blue sapphire and ruby, just without the trace elements that create color. It scores 9 on the Mohs scale, making it highly durable and resistant to scratching.
Where white sapphire differs from moissanite and CZ is in its optical performance. White sapphire has a lower refractive index than diamond, which means it lacks the brilliant sparkle most buyers are looking for in a diamond alternative. It tends to look slightly milky or glassy rather than the crisp, bright appearance of a diamond. It’s a beautiful gemstone in its own right, but as a diamond simulant, it underperforms optically.
The appeal of white sapphire lies in its “realness” as a gemstone. Unlike CZ or moissanite, white sapphire is a colored gemstone in a well-understood, widely traded category. Some buyers appreciate that. But if diamond-like sparkle is the goal, moissanite delivers it more convincingly. If you’re drawn to white sapphire, you might be better served by a lab-created white sapphire from a reputable retailer — they’re far less expensive than natural white sapphires and the optical difference is negligible for most buyers.
YAG (Yttrium Aluminum Garnet)
YAG was one of the original synthetic diamond simulants before CZ became dominant in the 1970s. It’s rarely used in fine jewelry today, but it occasionally shows up in vintage pieces and some budget jewelry lines. It has a Mohs hardness of around 8, reasonable optical properties, and is now largely a historical curiosity in the simulant market.
Glass
At the bottom of the simulant ladder is glass. Some manufacturers use leaded crystal or high-quality optical glass to simulate diamonds in costume jewelry, and the results can be surprisingly attractive in the right setting. The hardness is typically 5–6 on the Mohs scale, meaning glass “diamonds” scratch easily, chip with minimal force, and won’t survive daily wear in a ring intended to last years.
Glass simulants are fine for fashion jewelry or costume pieces. They’re not appropriate for anything intended to last, and any seller representing glass as moissanite or CZ is being deliberately misleading.
What Are Fake Diamonds Called?
The terminology around diamond simulants is inconsistent, and different people use different terms to mean slightly different things. Here’s a quick reference.
| Term | What It Usually Means |
|---|---|
| Simulated Diamond | Any material made to look like a diamond but isn’t one |
| Diamond Simulant | The industry/gemological term for the same thing |
| Fake Diamond | Consumer term — implies intentional deception, though not always accurate |
| Diamond Alternative | Broader term that can include lab-grown diamonds |
| CZ | Specifically cubic zirconia |
| Moissanite | Specifically silicon carbide (lab-created) |
| Synthetic Diamond | Often used to mean lab-grown diamond — not a simulant |
The term “synthetic diamond” deserves special attention because it causes genuine confusion. In popular usage, “synthetic” implies fake. In gemological usage, “synthetic” means created in a laboratory with the same chemical composition as the natural stone. A synthetic diamond is a real diamond — it’s a lab-grown diamond. A simulated diamond is not.
This is why buying from reputable retailers with clear product descriptions matters. You want to know exactly what you’re purchasing.
Simulated Diamonds vs. Lab-Grown Diamonds
This is probably the most important comparison on this page.
| Feature | Simulated Diamond | Lab-Grown Diamond |
|---|---|---|
| Is it a real diamond? | No | Yes |
| Carbon crystal structure | No | Yes |
| Passes diamond tester | Usually No | Yes |
| GIA/IGI certification available | No | Yes |
| Resale value | Very low | Low–moderate |
| Price (1ct equivalent) | $50–$600 | $800–$2,000+ |
| Durability (Mohs hardness) | 8–9.25 | 10 |
| Optical performance vs. diamond | Good to excellent | Identical |
The key point: if what you want is a diamond — even at a lower price — a lab-grown diamond delivers that. It has the same chemical composition, the same optical properties, the same hardness, and the same certification from respected labs like GIA and IGI. Lab-grown diamonds cost roughly 60–80% less than equivalent natural diamonds.
If you want something diamond-like at a dramatically lower price, and you’re comfortable owning something that isn’t a diamond, a simulant — specifically moissanite — is a legitimate option.
Where buyers get into trouble is treating these as interchangeable. They aren’t. A $300 moissanite is not “basically the same as” a $1,500 lab-grown diamond. They’re different materials with different properties and different long-term ownership profiles.
For a detailed breakdown of the lab-grown vs. natural diamond question, see our guide to lab-created vs. natural diamonds.
Moissanite vs. Cubic Zirconia: The Top Two Simulants Compared
If you’ve decided a simulant is right for you, the real decision usually comes down to moissanite vs. cubic zirconia. Here’s how they compare across the factors that matter most.
| Feature | Moissanite | Cubic Zirconia |
|---|---|---|
| Mohs Hardness | 9.25 | 8–8.5 |
| Refractive Index | 2.65–2.69 | 2.15–2.18 |
| Sparkle | Very high | High (when new) |
| Fire (color dispersion) | Higher than diamond | Moderate |
| Durability | Excellent | Good initially |
| Lifespan with daily wear | Decades | 2–5 years before clouding |
| Price (1ct equivalent) | $300–$600 | $20–$100 |
| Resale value | Minimal | Essentially none |
The recommendation for most buyers is clear: moissanite. The price difference between quality moissanite and quality CZ exists for a reason. CZ doesn’t hold up to daily wear the way moissanite does. If you’re buying a simulant for an engagement ring you plan to wear every day for years, CZ is likely to disappoint.
Think of it this way: a moissanite ring at $500 will still look essentially the same in 10 years. A CZ ring at $100 will look noticeably worn within a few years and might need the stone replaced entirely. When you factor in replacement costs, the gap between moissanite and CZ narrows considerably.
That said, the decision isn’t always straightforward. Some buyers specifically choose CZ for budget fashion rings, costume jewelry, or pieces they expect to rotate seasonally rather than wear indefinitely. For those applications, CZ makes complete sense — you’re not asking it to do something it isn’t designed for.
The exception is costume jewelry, fashion pieces, or rings you know you’ll only wear occasionally. For those applications, CZ offers exceptional visual impact at an almost negligible cost.
For a deeper look at how moissanite stacks up against actual diamonds, see our moissanite vs. lab diamonds comparison.
What Are Simulated Diamonds Worth?
Let’s be direct here: most simulated diamonds have essentially no resale value.
Cubic Zirconia
CZ is worth almost nothing on the secondary market. The raw material cost is negligible, and a used CZ stone — which will likely show wear — has no market. If you try to sell a CZ ring, you’ll recover the value of the metal, nothing more. Sometimes less, after factoring in the cost of having the stone removed.
Moissanite
Moissanite has more intrinsic value than CZ, but its resale value is still very low compared to diamonds. The secondary market for moissanite is thin, and used moissanite stones sell for a fraction of retail. You might recover 10–20% of what you paid, depending on the stone, brand (Charles & Colvard holds slightly better), and current demand.
White Sapphire
White sapphire as a diamond simulant holds limited resale value. Colorless sapphires are genuinely beautiful gemstones, but the demand for colorless vs. colored sapphire on the resale market is minimal.
The Bottom Line on Value
Simulated diamonds should be purchased for their aesthetic value and affordability — not as an investment or store of value. If long-term monetary value matters to you, you’re in the wrong category. A lab-grown diamond has at least some resale value. A natural diamond holds its value better than any simulant (though resale still typically means taking a loss versus retail).
This isn’t a reason to avoid simulants. It’s just the honest answer to the “are simulated diamonds worth anything?” question. They’re worth exactly what you pay for the experience of wearing them.
For context on where lab-grown diamonds sit on the resale value spectrum, see our guide to lab-grown diamond resale value.
Why Couples Choose Simulated Diamonds
There’s no shame in choosing a simulant, and the reasons buyers opt for them are genuinely practical.
Budget Constraints Are Real
The average engagement ring budget in the US hovers around $5,000–$6,000, but a meaningful percentage of couples spend significantly less. A quality moissanite in a well-made white gold or platinum setting can look spectacular at $500–$1,500 total. The same look with a lab-grown diamond would cost two to three times more. With a natural diamond, multiply again.
For couples prioritizing a wedding, a honeymoon, a house deposit, or simply not starting a marriage in debt, a simulant engagement ring is a financially rational choice.
Maximum Size for the Budget
A 2-carat moissanite costs roughly the same as a 0.5-carat natural diamond. If visual size matters and budget is fixed, the math isn’t complicated. Most simulant buyers are explicitly trading intrinsic value for visual presence.
Travel and Everyday Rings
This is a use case that resonates with a lot of engaged and married people. Wearing a $15,000 engagement ring to the beach, on a hiking trip, or while traveling internationally creates genuine anxiety for many wearers. A high-quality moissanite travel ring — essentially identical to the real thing visually — solves that problem neatly. You leave the original safely at home.
Ethical Considerations
Some buyers specifically prefer to avoid natural diamonds due to concerns about mining practices, environmental impact, or labor conditions. Lab-grown diamonds address many of these concerns, but simulants — particularly lab-created moissanite — eliminate mined gemstones entirely.
For buyers prioritizing ethics above all, a simulant is the clearest choice. For a thorough look at conflict-free options across the diamond category, see our guide on where to buy conflict-free diamonds.
Fashion and Non-Bridal Jewelry
Not every piece needs to be an investment. Cocktail rings, statement earrings, pendants, and layering pieces are areas where simulants excel. The visual payoff is high, the cost is low, and no one scrutinizes a fashion ring with a loupe.
The Downsides of Buying a Diamond Simulant
Giving you the honest picture means covering the downsides too — and there are real ones.
Durability (Especially for CZ)
Moissanite, at 9.25 Mohs, is genuinely durable. But CZ at 8–8.5 will scratch noticeably over time with daily wear. The prongs and metal of a ring typically outlast the CZ stone’s surface quality. If you buy CZ for everyday wear, expect to replace the stone every few years.
Some Simulants Lose Brilliance Over Time
CZ in particular becomes cloudy with wear as the surface microscopically scratches and accumulates residue. Cleaning helps, but a well-worn CZ stone will never look quite the same as it did new. Moissanite is much more resistant to this, which is one of the strongest arguments for choosing it over CZ despite the higher price.
No Diamond Tester Confirmation
For some buyers, this doesn’t matter at all. For others, knowing their stone will test as a real diamond carries symbolic importance. Moissanite and CZ will not pass a standard diamond conductivity tester. More sophisticated testers can distinguish moissanite from diamond using thermal and electrical readings.
Lower Prestige in Some Contexts
Social pressure around engagement rings is real, and some people genuinely care whether their ring is “real.” This is worth being honest with yourself about. If you know you’ll spend the next decade feeling self-conscious that your ring isn’t a diamond, the savings may not be worth the ongoing cost to your satisfaction. This is a personal decision with no objectively right answer.
Easier to Identify as Non-Diamond
An experienced jeweler, gemologist, or even a knowledgeable observer will usually be able to identify moissanite or CZ with a basic loupe or tester. The fire in moissanite is distinctive — more than a diamond. CZ has a different weight feel and visual texture. If discretion matters to you, this is worth knowing.
How to Spot a Quality Simulated Diamond (And Avoid Bad Ones)
Not all simulants are created equal, and the market has its share of misleading sellers. Here’s what to look for — and what to avoid.
For Moissanite
Quality moissanite comes graded and branded. Charles & Colvard’s Forever One grade is the industry standard for colorless moissanite (equivalent to D-F color). Their Forever Brilliant and Classic grades are slightly warmer in color. Reputable white-label manufacturers also produce quality stone, but vague descriptions like “premium moissanite” without any grading information should prompt more questions.
Look for retailers who provide stone dimensions, color grade equivalents, and their own warranty or guarantee. A quality moissanite ring should come with documentation, not just a ring in a box.
For Cubic Zirconia
CZ quality varies enormously. Higher-grade CZ — sometimes called “AAAAA” grade or “Russian cut” CZ — uses better raw material and more precise cutting, resulting in superior optical performance and marginally better durability. Budget CZ from fashion jewelry chains uses the lowest grade material.
The problem is that CZ grading isn’t standardized the way diamond grading is. Terms like “premium,” “luxury,” or “Swiss” CZ are marketing language without formal meaning. Buy CZ from retailers who are transparent about what you’re getting rather than ones using vague premium terminology.
Red Flags to Watch For
A seller who describes a simulant as “just like a diamond” or implies it’s difficult to tell the difference without being clear about what the stone actually is should raise caution. Reputable simulant sellers are proud of what they sell and don’t need to obscure it.
Similarly, be cautious about simulants priced suspiciously close to real diamond prices without certification. A $4,000 “diamond-like” stone with no GIA or IGI report is almost certainly not a diamond — and should be priced like a simulant, not like a diamond.
The best fake diamonds on the market guide covers specific products and brands worth considering if you’re actively shopping simulants.
How to Care for Simulated Diamond Jewelry
Simulants have different care requirements than diamonds, and treating them identically can damage them.
Moissanite is relatively easy to care for. It can be cleaned with warm soapy water and a soft brush, ultrasonic cleaners, and steam cleaners — the same methods used for diamonds. It’s resistant to most household chemicals. The main thing to avoid is chlorine bleach and harsh abrasives, which can damage the metal setting more than the stone itself.
Cubic Zirconia requires more careful handling. Ultrasonic cleaners are generally not recommended for CZ, as the vibrations can accelerate surface clouding. Warm soapy water and gentle hand cleaning is the safest approach. CZ also attracts grease and skin oils more readily than diamond or moissanite, so more frequent cleaning helps maintain brilliance.
White sapphire is fairly robust — clean with warm soapy water and occasional ultrasonic cleaning. Like moissanite, it’s durable enough for daily wear with standard care.
For long-term ownership, storing simulant jewelry separately from harder gemstones (including diamonds) prevents scratching. A soft pouch or lined jewelry box is sufficient.
For readers still weighing whether a simulant or a real diamond is the right call, here’s a direct comparison across the properties that matter most in real-world ownership.
| Factor | Simulated Diamond (Moissanite) | Lab-Grown Diamond | Natural Diamond |
|---|---|---|---|
| Chemical composition | Silicon carbide | Carbon | Carbon |
| Mohs hardness | 9.25 | 10 | 10 |
| Sparkle | Very high | High | High |
| Fire (rainbow flash) | Higher than diamond | Equivalent to natural | Benchmark |
| Long-term durability | Excellent | Excellent | Excellent |
| Resale value | Very low | Low | Moderate |
| Price (1ct equivalent) | $300–$600 | $800–$2,000 | $4,000–$8,000+ |
| Certification available | Brand warranty only | GIA / IGI | GIA / IGI |
| Passes diamond tester | No | Yes | Yes |
If you want to explore the full range of diamond alternatives, see our comparison of the best diamond alternatives for engagement rings.
Simulated Diamond Uses: Where They Work Best
Simulants aren’t one-size-fits-all. Here’s where they genuinely shine.
Engagement rings on a tight budget. A moissanite solitaire in a quality setting looks genuinely beautiful and will hold up to daily wear. For buyers where the ring matters more than what it’s made of, this is a completely valid choice.
Wedding bands with accent stones. Simulant stones in pave or channel-set wedding bands are common even among couples who chose natural or lab-grown diamonds for their center stone. The accent stones are too small for most people to scrutinize, and the cost savings are meaningful.
Travel rings. As discussed above, this is arguably the clearest use case. A $400 moissanite travel ring that travels, hikes, swims, and takes risks while the real ring stays home is a genuinely practical solution many couples use.
Fashion and cocktail jewelry. Large statement rings, chandelier earrings, stacked layering pieces — simulants excel here. No one expects a 4-carat cocktail ring to be a diamond.
Promise rings and pre-engagement jewelry. Some couples want something meaningful for a promise ring without the engagement ring budget. A simulant fills that role well.
Should You Buy a Simulated Diamond for Your Wedding?
Here’s a practical framework for making this decision.
Buy a Simulated Diamond If:
- Your budget is genuinely limited and a beautiful ring matters more than what it’s made of
- You want maximum visible size for your money
- You’re buying a travel ring or secondary ring
- You want fashion jewelry without the fine jewelry price tag
- Ethics around mining are your primary concern and lab-grown doesn’t feel different enough
- You’re young, your circumstances will change, and you’d rather upgrade later than overspend now
Think Carefully Before Buying If:
- You want a genuine diamond and are considering a simulant as a substitute under social pressure — that’s different from genuinely wanting a simulant
- You care about the long-term integrity and durability of the stone above all
- Resale or heirloom potential matters to you
- You’d spend years wishing you’d bought a real diamond
Better Alternatives to Consider:
If you want something “real” at a lower price than natural diamonds, lab-grown diamonds are almost always the better choice over simulants. You get actual diamond properties, GIA or IGI certification, and the knowledge that it’s the real thing — just grown in a lab rather than mined. The price gap has narrowed significantly in recent years.
For a deep dive into that decision, see our guide to lab-created vs. natural diamonds and our roundup of the best places to buy lab-grown diamonds online.
The Final Recommendation
For most buyers looking at diamond simulants, moissanite is the best option on the market today. Its combination of durability, optical performance, and price is genuinely compelling. Charles & Colvard (the original moissanite brand) and several reputable white-label manufacturers produce stones that hold up to daily wear for decades and look stunning in the right setting.
If budget allows even a step up, however, a lab-grown diamond gives you a certified real diamond for less than half the price of a natural equivalent. For an engagement ring intended to last a lifetime and carry sentimental weight across generations, that distinction matters to a lot of people — and it’s worth considering before defaulting to a simulant.
There’s no wrong answer here. There’s only the answer that matches your priorities, your budget, and your comfort with what’s on your finger.
Where to Buy Simulated Diamond Jewelry
If you’ve decided a simulant is the right call, buying from a reputable retailer matters — especially with moissanite, where quality varies considerably.
For moissanite: Charles & Colvard, MoissaniteCo, and several major retailers including Brilliant Earth carry quality moissanite. Look for brands that offer their own warranties and use the Forever One or Certified grade stones.
For CZ fashion jewelry: Major retailers including Blue Nile carry CZ pieces at transparent prices. For high-volume fashion jewelry with CZ, Amazon and Etsy sellers with verified reviews can work well — just don’t pay premium prices for a simulant.
For lab-grown diamonds (the best step up from simulants): James Allen, Blue Nile, and Brilliant Earth are the three most established online retailers with large lab-grown diamond inventories, strong return policies, and transparent pricing.
See our detailed breakdown of the best online diamond stores and our comparison of James Allen vs. Blue Nile for guidance on where to start your search.
Frequently Asked Questions
What are simulated diamonds?
Simulated diamonds are gemstones or materials designed to look like diamonds but made from entirely different substances. They are not real diamonds. Common simulated diamonds include cubic zirconia (zirconium dioxide), moissanite (silicon carbide), and white sapphire (corundum).
Are simulated diamonds real diamonds?
No. Simulated diamonds are not real diamonds. They may be real gemstones in their own right — moissanite and white sapphire are — but they do not share the chemical composition or crystal structure of a diamond.
What is the difference between a simulated diamond and a lab-grown diamond?
A lab-grown diamond is a real diamond created in a laboratory from carbon, identical to a natural diamond in chemistry and crystal structure. A simulated diamond is not a diamond at all — it’s a different material (like moissanite or CZ) that looks similar to a diamond. The two are not interchangeable.
What are fake diamonds called?
Common terms include diamond simulants, simulated diamonds, or the specific material name (cubic zirconia, moissanite). In casual usage, “fake diamond” is common. Note that “synthetic diamond” technically refers to lab-grown diamonds — which are real diamonds — not simulants.
Which simulated diamond looks most like a real diamond?
Moissanite is generally considered the closest-looking simulant to a diamond, particularly in its brilliance and durability. High-quality moissanite is difficult to distinguish from diamond without specialized testing equipment. The slightly higher fire (rainbow dispersion) is the most common way an experienced observer identifies it.
Are simulated diamonds worth anything?
Very little on the resale market. CZ has essentially no resale value. Moissanite has minimal resale value — typically 10–20% of retail in best-case scenarios. Simulated diamonds should be purchased for beauty and wearability, not as a store of value.
What are simulated diamonds used for?
Simulated diamonds are used in engagement rings, wedding bands, travel rings, fashion jewelry, earrings, pendants, and costume jewelry. They’re particularly popular as budget-conscious engagement ring alternatives and as travel/secondary rings for people who want to leave their primary ring safely at home.
Is moissanite a simulated diamond?
Yes, moissanite is classified as a diamond simulant because it resembles a diamond visually but has a different chemical composition. However, moissanite is also a genuine mineral (silicon carbide) in its own right — it’s not a fake or counterfeit material. It simply isn’t a diamond.
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