What is the difference between lab grown diamonds and moissanite?

Lab grown diamonds are chemically identical to mined diamonds (pure carbon), while moissanite is silicon carbide. Lab diamonds have identical properties to natural diamonds, while moissanite offers 2.4× more fire and brilliance at 90 % less cost.

Which is better: lab diamond or moissanite?

Lab diamonds are better for those wanting authentic diamond properties and traditional appearance. Moissanite is better for those prioritising brilliance, fire, and value — offering superior sparkle at significantly lower cost.

Is moissanite more brilliant than lab diamonds?

Yes, moissanite has a higher refractive index (2.65 vs 2.42) and superior fire dispersion, creating more rainbow sparkle and brilliance than lab diamonds, especially in natural and low-light conditions.

How much do lab diamonds cost compared to moissanite?

Lab-grown diamonds cost around 70% less than mined diamonds but are still more expensive than moissanite. Moissanite offers significant additional savings compared to lab-grown diamonds.

Are lab diamonds and moissanite both ethical?

Yes, both lab diamonds and moissanite are ethically created in laboratories with minimal environmental impact compared to mined diamonds. Both offer guilt-free luxury alternatives.

Which is more durable: lab diamond or moissanite?

Lab diamonds are harder (10 on Mohs scale) than moissanite (9.25), but both are extremely durable for daily wear. The difference is negligible for practical engagement ring use.

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Lab-Grown Diamond vs Moissanite

Quick Comparison

Lab-Grown Diamonds

Pure carbon, same as mined diamonds. Hardness of 10 on the Mohs scale. The same optical properties and certified grading standards. A real diamond grown in a lab.

Moissanite

Produces 2.4× more fire than diamonds. Refractive index of 2.65 creates visible rainbow flashes. Sparkles strongly in all light. Silicon carbide crystal structure.

STONE COMPARISON

moissanite

brilliance

9.5

durability

9.25

fire dispersion

10.40

relative value

refractive index

2.65

colour retention

8.5

thermal stability

9.8

light performance

9.6

Higher fire dispersion than diamonds. More visible sparkle. Lower cost per carat.

lab diamond

brilliance

durability

fire dispersion

4.40

relative value

refractive index

2.42

colour retention

9.5

thermal stability

light performance

9.2

Same composition as mined diamonds. Lab-grown without mining. Real diamond, different source.

THE FOUR C'S

Cut

How light moves through the stone. A well-cut stone reflects more light. This determines brilliance and sparkle.

Moissanite

Shows more rainbow fire than diamonds. Light disperses into visible color flashes. Sparkles strongly even in dim lighting.

Lab diamond

Cut with precision for maximum light return. The same brilliance as mined diamonds. Same optical properties, different origin.

Colour

The absence of color in a stone. Graded from D (no color) to Z (light yellow). Most differences invisible to untrained eyes.

Moissanite

We stock DEF color grades only. Some stones show faint blue or yellow tints under certain light. The strong brilliance usually masks these subtle tones.

Lab diamond

The same color range as mined diamonds. Every grade from D to Z available. Match stones precisely for multi-stone settings.

Clarity

Internal flaws and surface marks in the stone. Most are invisible without magnification. Fewer inclusions mean more light passes through.

Moissanite

Most are eye-clean with no visible flaws. Grown in controlled conditions with fewer inclusions. VS clarity or better is standard.

Lab diamond

Available in every clarity grade from flawless to included. Graded by the same standards as mined diamonds. Pick the clarity level you need.

Carat

Weight of the stone in carats. One carat equals 0.2 grams. Cut quality affects how large a stone looks at any weight.

Moissanite

Moissanite is typically sold by millimetre size rather than carat weight, with a "diamond equivalent" size given for reference. Its lower density means a moissanite of the same dimensions weighs less than a diamond.

Lab diamond

Same weight and dimensions as mined diamonds. Measured by standard carat weight. One carat looks like one carat.

CONSUMER INSIGHTS

Practical facts about performance, cost, and real-world use. What you need to know before choosing.

Moissanite

Costs 80–90% less than equivalent diamonds. A one-carat moissanite costs what a quarter-carat diamond costs.

9.25 on the Mohs hardness scale. Hard enough for daily wear. Resists scratching in normal use.

Lab-grown with controlled processes. Lower environmental impact than mining. No supply chain concerns.

Higher refractive index creates more fire than diamonds. More visible rainbow flashes. Stands out in any light.

Lab diamond

Graded by the same standards as mined diamonds. GIA and IGI provide the same certification reports.

Cost around 70% less than mined diamonds. Same chemical composition at a lower price point.

Pure carbon in a cubic crystal structure. The same physical and optical properties as mined diamonds.

Growing market acceptance. More jewelers stock them. More buyers choose them each year.

Which Stone Suits You?

Both are excellent choices. The right one depends on what matters most to you.

Moissanite

More fire and brilliance than diamond

Maximum sparkle — 2.4× more fire than diamond
Significantly lower cost per carat
9.25 hardness — durable for daily wear
Ideal if budget or stone size is the priority

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