Moissanite vs. Diamond vs. Lab-Grown Diamond

Everything you need to know before buying — explained honestly, without jargon.

When you're spending real money on jewelry, you deserve a straight answer. This page breaks down the three most popular gemstone options in 2024 — natural diamonds, lab-grown diamonds, and moissanite — so you can decide with confidence what is actually right for you.

Spoiler: all three can be absolutely stunning. The difference is in sparkle character, price, sourcing, and what matters to you.

What are they, exactly?

Natural Diamond

Formed deep in the Earth over billions of years. Extracted through mining operations — a process that has well-documented environmental and ethical concerns. Sold through a long supply chain of wholesalers, polishers, and retailers, each adding margin.

Lab-Grown Diamond

Chemically, physically, and optically identical to a natural diamond — same carbon crystal structure, same hardness (10/10 Mohs), same fire and brilliance. Grown in a controlled laboratory environment in weeks rather than billions of years. Typically costs 70–90% less than an equivalent natural diamond and carries IGI or GIA certification.

Moissanite

Originally discovered in a meteor crater in 1893 by Nobel Prize winner Henri Moissan. Natural moissanite is extraordinarily rare — all gem-quality moissanite today is lab-created. Composed of silicon carbide, it is the second hardest gemstone in the world (9.25/10 Mohs) and has a higher refractive index than diamond, meaning it throws more rainbow-like fire. It is not a diamond — and it does not try to be. It is its own gemstone with its own unique character.

Side-by-Side Comparison

Property	✦ Moissanite	Lab-Grown Diamond	Natural Diamond
Composition	Silicon Carbide (SiC)	Pure Carbon (C)	Pure Carbon (C)
Hardness (Mohs)	9.25 / 10	10 / 10	10 / 10
Brilliance (RI)	2.65 — higher than diamond	2.42	2.42
Fire / Rainbow Sparkle	★★★★★ Exceptional	★★★★ High	★★★★ High
Price (per carat equivalent)	฿1,000–฿5,000	฿8,000–฿40,000	฿60,000–฿500,000+
Ethically sourced	✔ Lab-created	✔ Lab-created	✖ Mining required
Eco-friendly	✔ Low impact	✔ Lower impact	✖ High land/water use
Durability for daily wear	✔ Excellent	✔ Excellent	✔ Excellent
Resale value	Low (as with all jewelry)	Low–moderate	30–50% of retail
Certificate	GRA certificate (on eligible pieces)	IGI or GIA	GIA / AGS
Passes diamond tester?	✔ Yes (thermal testers)	✔ Yes	✔ Yes
Who it's for	Maximum sparkle, smart budget, ethical buyer	Diamond loyalist, ethical buyer, bigger stone for less	Traditional sentiment, maximum prestige

Which one is right for you?

Choose Moissanite if…

You want the most sparkle per baht — period.
You want a 1–2 CT look without a 1–2 CT price tag.
You care about ethical and eco-friendly sourcing.
You want to spend smart and invest the savings elsewhere — honeymoon, home, experiences.
You love unique rainbow fire that stands out from the crowd.

Choose Lab-Grown Diamond if…

You or your partner specifically want a diamond — composition matters to you.
You want an IGI/GIA certificate that says "diamond."
You want diamond's clean, white sparkle (less rainbow fire than moissanite).
Budget is flexible but you still want to avoid mined stone markups.

Choose Natural Diamond if…

Tradition and sentiment around a "real mined" stone is important to you or your family.
You view it as a long-term asset or heirloom.
Budget is not a primary concern.

Why buy from Impimo instead of a traditional jeweler?

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Cut out the middlemen

Traditional jewelers buy from wholesalers, who buy from polishers, who buy from miners. Every step adds 30–100% margin. We source directly and sell directly — you get more stone for your money.

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Transparent certificates

Eligible moissanite pieces come with a GRA certificate. Lab-grown diamonds carry IGI or GIA certification. We tell you exactly which products include a certificate — no vague promises.

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Quality you can verify

Every piece meets Impimo Quality Guarantee standards. If it doesn't sparkle as described, we make it right. No fine print, no runaround.

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Custom design available

Want a specific cut, setting, or carat weight? We offer custom design services. Your idea, our craft — at a fraction of a traditional jeweler's price.

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Free shipping in Thailand

Orders over ฿1,500 ship free anywhere in Thailand. No hidden delivery fees — the price you see is the price you pay.

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Ethical by design

Every gemstone we sell — moissanite or lab-grown diamond — is created in a lab. No mining, no conflict stones, no environmental destruction.

Common myths — busted

"Moissanite looks fake."

To the naked eye, a well-cut moissanite is indistinguishable from a diamond — most jewelers cannot tell the difference without equipment. Its higher refractive index often makes it look more brilliant than a diamond of the same size.

"Lab-grown diamonds aren't real diamonds."

False. Lab-grown diamonds are chemically and physically identical to mined diamonds. The FTC (US Federal Trade Commission) ruled in 2018 that "real diamond" includes lab-grown diamonds. IGI and GIA certify them as diamonds.

"Natural diamonds hold their value."

On average, a natural diamond loses 50–70% of its retail value the moment you leave the store. They are not investment assets for most buyers. A reputable financial advisor would not recommend diamonds as an investment.

"Moissanite will scratch or cloud over time."

At 9.25 Mohs hardness, moissanite is harder than all other gemstones except diamond. It will not scratch from daily contact. It does not cloud, yellow, or lose brilliance over decades of wear.

"You need to spend a month's salary on a ring."

That rule was invented by a De Beers marketing campaign in the 1930s. There is no rule. The right ring is the one that makes your partner smile — at any price.