Moissanite vs Diamond: Price, Sparkle and Durability Compared

Moissanite vs diamond comes down to a few clear trade-offs. Diamond is harder and, if it's natural, holds more of its value. Moissanite has more than twice the rainbow fire, is nearly as hard and costs a fraction of the price at the same size. From a few feet away, most people can't tell them apart. Up close, especially in sunlight, moissanite's colorful flashes usually give it away.

We sell D color VVS1 moissanite and make lab-grown diamond pieces to order, so we work with both stones every day. Below, we compare them on looks, durability, price at the same size, resale, ethics and testing, with live prices from our store and the figures gem labs use. For the basics on what moissanite is, read our explainer: is moissanite a real diamond?

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What's the difference between moissanite and diamond?

A diamond is crystallized carbon. It's either mined or grown in a lab, and a lab-grown diamond has the same crystal structure, so it's a real diamond too. Moissanite is silicon carbide, a different mineral. Natural moissanite only turns up as tiny grains, so every moissanite in jewelry is grown in a lab.

Gemologists call moissanite a diamond simulant: a different material that imitates diamond's look. The FTC's buying advice puts it plainly: moissanite may look just like a mined diamond, but it's not the same. That's why "moissanite diamond" is a misleading name. Here's how the two compare:

Prices on adamans.com as of October 13, 2026.

Which sparkles more: moissanite or diamond?

Moissanite, if by sparkle you mean brightness and color. Its refractive index of 2.65 to 2.69 (diamond's is 2.42) means it bends light more sharply, so it looks very bright. Its dispersion is more than twice diamond's, so it splits white light into more rainbow flashes, which jewelers call fire. Diamond's sparkle is whiter and more even. Which you prefer is a matter of taste.

From arm's length

At a normal viewing distance, in indoor light, most people can't tell the two apart. With small stones, like the 3mm to 5mm stones in tennis chains and bracelets, even the trade can miss it. In 2015, GIA's New York lab found two moissanites mixed in among the 162 small round stones of a colored diamond bracelet. They were caught by lab testing, and GIA noted that small set stones are seldom tested because the mounting gets in the way.

Up close and in sunlight

Up close, the difference shows, mostly as color. Moissanite's fire is strongest in direct sunlight and in bigger stones. In a center stone of a carat or more, the rainbow flashes are easy to spot. Some people love that. Others find it too much, and for them diamond's calmer look in a large stone is worth paying for. In rows of small stones, moissanite's fire mostly reads as extra brightness.

Color and clarity

Diamond color is graded from D (colorless) to Z (light yellow or brown). Early moissanite from the late 1990s and 2000s often had a yellow, green or gray tint. Today's top grades are colorless and graded on the same letter scale. Ours is D color, the top of the scale. Clarity uses the familiar diamond-style scale too. Ours is VVS1, which means any inclusions are so slight that a skilled grader has trouble seeing them under 10x magnification.

Durability: is moissanite as hard as diamond?

Nearly. Diamond is the hardest gem, at 10 on the Mohs scale. Moissanite is 9.25, harder than ruby and sapphire (9) and topaz (8). Both resist everyday scratches far better than softer gems, so both are fine for jewelry you wear every day.

Hardness isn't toughness, though. Hardness is resistance to scratching. Toughness is resistance to chipping and breaking. In GIA's words, diamond is "the hardest gemstone, but not necessarily the toughest." A hard knock can chip a diamond, especially on a thin edge or a sharp point such as a pear or marquise tip. The same care applies to moissanite. No gem is knock-proof.

Neither stone clouds or changes color with age. A dull stone just needs cleaning: warm water, a drop of mild dish soap and a soft brush.

Moissanite vs diamond price at the same size

Price is the biggest difference, and it's clearest on the same piece. We make our 5mm tennis designs in both stones. Here are the prices on adamans.com as of October 13, 2026:

On the bracelet, the lab-grown diamond version costs about 12 times as much. The gap grows with the number of stones: going from the 8-inch bracelet to the 20-inch chain adds $139 in moissanite and $9,720 in lab-grown diamond. The metals differ, so check each product page for details. You can compare our 5mm Moissanite Tennis Bracelet with our lab-grown diamond tennis bracelets.

A natural diamond version would cost more again. GIA notes that lab-grown diamonds come at a reduced price point compared with natural ones, and that lab-grown prices have fallen in recent years. Diamond prices also climb steeply with weight. GIA points out that a 0.99 carat and a 1.00 carat diamond are hard to tell apart by eye, yet the price difference can be significant.

Resale value: does moissanite hold its value?

No, and we'd rather say so up front. Moissanite has little resale value. Every stone is grown in a lab, so a used piece competes with new ones that cost little, and it sells for far less than you paid. Buy moissanite to wear, not as an investment.

Diamonds hold more. Natural diamonds usually keep the most value of the three. Lab-grown diamond prices have been falling, and when new prices fall, used stones follow. If resale matters to you, get the buyback and return terms in writing before you buy, as the FTC advises.

Ethics and origin

Every moissanite in jewelry is grown in a lab, so no mine is involved. The same goes for lab-grown diamonds. Natural diamonds are mined. Since 2003, the Kimberley Process has certified rough diamonds to keep conflict diamonds, sold to fund armed groups fighting governments, out of the mainstream trade. GIA calls it a positive step that still faces challenges.

We don't call moissanite eco-friendly. Growing crystals takes very high temperatures, and that takes energy. What moissanite avoids is mining. If origin matters to you, the FTC suggests asking the seller where a diamond came from and whether they test to separate natural from lab-grown stones.

How to tell moissanite from diamond

By eye, at a normal distance, usually you can't. These are the checks that work:

1. Look for doubled facet edges. Through a 10x loupe, look into the stone at a slight angle rather than straight through the top. Moissanite is doubly refractive, so the back facet edges look doubled. Diamond's never do. GIA calls this doubling a key identification feature.
2. Use the right tester. A basic diamond tester measures how fast heat moves through the stone. Moissanite conducts heat almost as well as diamond, so it passes. Testers that add an electrical check can flag it, because natural diamond barely conducts electricity. Some lab-grown diamonds can trip that check too. More in does moissanite pass a diamond tester?
3. Weigh a loose stone. Moissanite is about 8.5% less dense than diamond. A moissanite cut to the size of a 1.00 carat diamond weighs about 0.91 carat.
4. Ask for a lab report. A gem lab can identify moissanite for certain. Check that the paperwork matches the stone. In 2020, GIA reported a moissanite with a fake GIA inscription that carried the report number of a natural diamond.

Moissanite vs lab-grown diamond

A lab-grown diamond is a real diamond. GIA notes it has the same crystal structure as a natural diamond and nearly the same chemical, optical and physical properties, so it has diamond's hardness and whiter sparkle. Against moissanite, it costs far more and takes longer to get: we make lab diamond pieces to order in about 4 weeks. Against natural diamond, it costs less but holds less value. More in our moissanite vs lab diamond comparison.

Moissanite or diamond: which should you choose?

Choose moissanite if:

• You want the biggest, brightest look your budget allows.
• You like extra fire and color in your stones.
• You'll wear it every day and don't want to worry about the cost of a knock or a loss.
• You'd rather not buy a mined stone.

Choose diamond if:

• It matters to you, or to the person you're buying for, that the stone is a diamond.
• You want the hardest stone, or a calm white sparkle in a large center stone such as an engagement ring.
• Resale value matters. Then choose natural, since lab-grown prices have been falling.
• You're comfortable paying many times more for the same size: about 12 to 30 times more for lab-grown on our pieces, and more again for natural.

Our moissanite

Our colorless stones are D color VVS1 moissanite. Every moissanite piece ships with a GRA report and passes a standard diamond tester. Every piece also comes with a lifetime warranty card, covering manufacturing defects, breakage in normal wear, loose or lost stones and fading of the finish. On our silver-finish 5mm tennis chain and bracelet, the listed material is 18K white gold plating. We sell moissanite as moissanite, never as diamond.

We also sell a cheaper line set with cubic zirconia. It looks the part from a distance, but it won't pass a diamond tester and it isn't moissanite. Our moissanite vs cubic zirconia guide explains the difference.

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Moissanite vs diamond: common questions

Can you tell the difference between moissanite and diamond?
Not easily by eye from a normal distance, especially in small stones. Up close, moissanite shows more rainbow fire, and under a 10x loupe its facet edges look doubled. A tester with an electrical check or a gem lab can confirm it.

Does moissanite sparkle more than diamond?
It shows more fire. Moissanite's dispersion is about 0.104 against diamond's 0.044, so it throws more than twice the rainbow color. Diamond's sparkle is whiter and calmer.

How much cheaper is moissanite than diamond?
A lot. As of October 13, 2026, our 8-inch 5mm moissanite tennis bracelet is $315.99 and the same design in lab-grown diamond is $3,886.99, about 12 times more. A natural diamond version would cost more again.

Is moissanite as durable as diamond?
Almost. Moissanite is 9.25 on the Mohs scale and diamond is 10, so diamond resists scratches slightly better. Both are hard enough for daily wear, and both can chip from a hard knock.

Does moissanite hold its value?
No. Moissanite has little resale value, so buy it to wear, not as an investment. Natural diamonds hold more value, and lab-grown diamond prices have been falling.

Is moissanite lighter than diamond?
Yes. Moissanite is about 8.5% less dense, so a moissanite the size of a 1.00 carat diamond weighs about 0.91 carat. That's why moissanite is usually sold by size in millimeters or by diamond equivalent weight.

Is a lab-grown diamond better than moissanite?
It depends on what you value. A lab-grown diamond is a real diamond: harder, with a whiter sparkle. Moissanite has more fire and costs far less. On our 5mm tennis bracelet, the lab-grown version is about 12 times the price.