Moissanite and diamond gemstones shown side by side for comparison
THE CLEAR COMPARISON

Moissanite vs. Diamond

Two Distinct Gemstones. One Clear Comparison.

Compare brilliance, durability, composition and price to understand how moissanite and diamond differ—and which characteristics matter most when choosing a stone for your ring.

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AT A GLANCE

Moissanite vs. Diamond Comparison

A practical look at the main physical, visual and price differences between moissanite and diamond.

FEATURE
MOISSANITE
DIAMOND
01
Brilliance REFRACTIVE INDEX
2.65–2.69 Pronounced spectral fire and lively sparkle.
2.42 Classic diamond brilliance with a different balance of light.
02
Hardness MOHS SCALE
9.25 Excellent durability for frequently worn jewelry.
10 The highest rating on the Mohs hardness scale.
03
Composition MATERIAL
Silicon Carbide A distinct gemstone composed of silicon carbide.
Carbon Diamond is a crystalline form of carbon.
04
Origin TYPICAL JEWELRY SOURCE
Lab-Created Modern jewelry moissanite is produced in controlled conditions.
Natural or Lab-Grown Diamonds are available from different origins.
05
Price Position TYPICAL RELATIVE COST
More Accessible Often allows greater visible size within a given budget.
Typically Higher Pricing varies significantly by diamond type and grade.
01 Brilliance REFRACTIVE INDEX
MOISSANITE 2.65–2.69

Pronounced spectral fire and lively sparkle.

DIAMOND 2.42

Classic diamond brilliance with a different balance of light.

02 Hardness MOHS SCALE
MOISSANITE 9.25

Excellent durability for frequently worn jewelry.

DIAMOND 10

The highest rating on the Mohs hardness scale.

03 Composition MATERIAL
MOISSANITE Silicon Carbide

A distinct gemstone composed of silicon carbide.

DIAMOND Carbon

Diamond is a crystalline form of carbon.

04 Origin TYPICAL JEWELRY SOURCE
MOISSANITE Lab-Created

Produced in controlled laboratory conditions.

DIAMOND Natural or Lab-Grown

Diamonds are available from different origins.

05 Price Position TYPICAL RELATIVE COST
MOISSANITE More Accessible

Often allows greater visible size within a given budget.

DIAMOND Typically Higher

Pricing varies significantly by type and grade.

Values are approximate and may vary according to cut, grading method and individual gemstone.

BEAUTY IN DIFFERENT WAYS

How Moissanite and Diamond Differ

Their optical properties create different expressions of brilliance, fire and contrast.

Round moissanite gemstone displaying spectral fire
MOISSANITE

More Spectral Fire

Moissanite has a higher refractive index, so it can display more visible rainbow flashes under direct or focused light.

Round diamond gemstone showing classic diamond brilliance
DIAMOND

Classic Diamond Brilliance

Diamond has its own characteristic balance of white brilliance, contrast and spectral fire.

Moissanite and diamond gemstones displayed side by side
YOUR PRIORITIES

Which Look Feels Right?

Neither stone needs to imitate the other. The better choice depends on appearance, durability, budget and what matters to you.

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CHOOSING YOUR STONE

Moissanite or Diamond for an Engagement Ring?

Both can be beautiful choices. The better fit depends on the appearance, budget and characteristics you value most.

MOISSANITE

Consider Moissanite If You Prefer

  • Pronounced spectral fire and lively sparkle
  • A more accessible price position
  • Greater visible size within your budget
  • A durable lab-created gemstone
DIAMOND

Consider Diamond If You Prefer

  • The traditional diamond material
  • Classic diamond light performance
  • Natural or lab-grown diamond options
  • Maximum hardness on the Mohs scale
Moissanite engagement ring
STILL DECIDING?

Compare the Details That Matter

If brilliance, visible size and everyday wear are your priorities, explore our moissanite engagement rings and see how different cuts and proportions look in finished designs.

EXPLORE MOISSANITE RINGS → LEARN ABOUT THE 4Cs →
COMMON QUESTIONS

Moissanite vs. Diamond FAQs

Is moissanite a diamond?
No. Moissanite and diamond are different gemstones. Moissanite is silicon carbide, while diamond is carbon. Learn more in our What Is Moissanite guide .
Which sparkles more, moissanite or diamond?
Moissanite generally displays more spectral fire because of its higher refractive index. Diamond has a different visual character, with its own balance of brilliance, contrast and fire.
Does moissanite look different from diamond in real life?
Yes, the difference can be noticeable under certain lighting. Moissanite often shows more colorful spectral flashes, while diamond tends to display a different balance of white brilliance, contrast and fire. Cut and stone size can also influence the appearance.
Is moissanite durable enough for an engagement ring?
Yes. Moissanite measures approximately 9.25 on the Mohs hardness scale, making it highly suitable for engagement rings and other frequently worn jewelry.
Is moissanite less expensive than diamond?
Moissanite is generally more accessible in price than diamonds of a similar visible size. This can make a larger face-up appearance possible within the same jewelry budget.
Which is better for an engagement ring, moissanite or diamond?
Neither is universally better. Moissanite offers distinctive spectral fire, excellent durability and a more accessible price position, while diamond offers the traditional diamond material and a different style of light performance. The better choice depends on your priorities and preferred appearance.
What should I look for when choosing moissanite?
Consider cut, color, clarity and actual millimeter dimensions rather than carat weight alone. Our Moissanite 4Cs Guide explains these quality factors in more detail.
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