Moissanite or Lab-Grown Diamond? Comparative Guide 2026

You've spent weeks (or months) thinking about the perfect ring. You've seen moissanite everywhere. You've also heard about lab-grown diamonds. And now here you are, trying to work out which one is best for you, your budget and your values.

This guide has no agenda. We don't sell more moissanite than lab diamonds, or the other way round. We simply want you to make the best possible decision: informed, pressure-free and myth-free.

What they are, exactly

Lab-Grown Diamond

A lab-grown diamond is a real diamond. The same chemical composition (pure carbon), the same crystal structure, the same hardness (10 on the Mohs scale). The only difference from a natural diamond is where it formed: in a controlled chamber rather than deep inside the Earth over millions of years.

It costs 30 to 40% less than an equivalent natural diamond. A 1-carat lab-grown solitaire is around €500-1,000, compared with €2,000-5,000 for a natural one. The price difference becomes far more noticeable as the stones get larger.

Moissanite

Moissanite is silicon carbide (SiC). It isn't a diamond, and it doesn't pretend to be. It was first discovered in 1893 by the scientist Henri Moissan in fragments of a meteorite. Today, all moissanite on the market is synthesised in a laboratory.

Its price is radically different: one carat of moissanite costs €500-800. That's 70-90% less than an equivalent lab diamond.

Comparison Table: Moissanite vs Lab Diamond

Sparkle: do they look the same?

Here there's a real difference worth knowing about. Moissanite has a higher refractive index than diamond (2.65-2.69 vs 2.42), which means it throws off more rainbow flashes: that "fire" effect which can be spectacular in direct light, but which in some settings comes across as flashier than the classic brilliance of a diamond.

To an untrained eye, the difference is hard to spot. But if you compare two rings side by side, the diamond has a whiter, more restrained sparkle; moissanite, a livelier one with more colour dispersion.

There's no right answer. Only preferences.

When to choose moissanite

Moissanite is for you if...

• Budget comes first: You want a large, beautiful stone without remortgaging the house. With moissanite you can have a 2-carat solitaire for what a 0.7 ct lab diamond would cost.
• The symbol matters more than the material: What unites two people isn't the chemical composition of a stone. If you're both clear on that, moissanite is an honest and beautiful choice.
• Ethics and ecology are a priority: Lab-created moissanite has a practically zero footprint. If origin weighs heavily in your purchase decision, moissanite wins hands down.
• Diseño over the label: If what you're after is a ring you fall in love with visually (shape, setting, metal) and the "diamond" label isn't essential, moissanite gives you plenty of scope for less money.

When to choose a lab-grown diamond

A lab diamond is for you if...

• You want a genuine diamond: Chemistry, structure, GIA certificate. If part of your decision is "I want to be able to say it's a diamond" (and there's nothing wrong with that), lab-grown delivers it without compromising ethical values or sending the price soaring.
• An IGI or GIA certificate matters: Lab-grown diamonds are certified to the same standards as natural ones. You get the 4Cs (colour, clarity, cut, carat weight) documented. Moissanite has its own certificates, but they aren't directly comparable.
• You're thinking about the future: Although the resale value of lab diamonds has also fallen, it's still higher than that of moissanite. If in 20 years you want to sell or trade in the ring, a lab diamond starts with an advantage.
• 61% of couples choose it in 2026: And it's no coincidence. A lab diamond offers the full diamond experience (brilliance, hardness, certificate) at a price that would have been unthinkable 10 years ago.

Frequently asked questions

Can a jeweller tell moissanite from diamond with the naked eye?

With the right instruments, yes. Standard diamond testers detect a diamond's electrical conductivity, but moissanite conducts it too (unlike other stones). However, modern dual testers can tell the two apart. To the naked eye, the difference is very hard to see.

Does moissanite scratch over time?

With a hardness of 9.25 on the Mohs scale, moissanite is the second-hardest stone used in jewellery, second only to diamond (10). For everyday wear in an engagement ring, it's completely durable. Visible wear after years of daily use is minimal.

Do lab-grown diamonds lose value?

In recent years, the wholesale price of lab diamonds has dropped significantly as production scales up. That's good for the initial buyer, but it means resale value has fallen too. Neither one (moissanite or lab) is an investment. They're jewels to wear and enjoy.

Which sparkles better in photos and on Instagram?

Moissanite photographs beautifully with flash or direct light: that rainbow fire looks stunning on camera. A lab diamond gives a more elegant, understated result. It depends on the style you want in your photos.

Can I customise both options?

Yes. At Bravora we work with both moissanite and lab-grown diamonds. In both cases the process is the same: 3D renders beforehand, hand-selection of the stone, and individual crafting, never in mass-production moulds. The result is unique whichever material you choose.

Our position at Bravora

We don't believe in selling the most expensive option. We believe in helping you make the best decision for you.

If budget is the deciding factor and you want to maximise the size or design of the ring, moissanite is a completely legitimate and beautiful choice. If you want the GIA certificate, the "diamond" name and everything that comes with it (at a price far below natural), lab-grown is the answer.

What we can guarantee in both cases: the ring is cast from scratch for you, the stone is hand-selected, and you'll receive 3D renders before we make anything. No batches, no generic catalogue.

Customise your ring → Free, no obligation

View lab-grown diamond rings

If you've decided on a lab-grown diamond, these are the settings we pair it with.

• Engagement Rings with IGI Lab-Grown Diamonds