Moissanite vs diamond price comparison in 2026 is really a comparison of priorities. Moissanite can give a larger visible stone for less. Lab-grown diamond costs more but is diamond. Mined diamond usually costs the most and carries the most traditional positioning.
The useful comparison
Do not compare only "one carat" labels. Compare the finished ring: center stone dimensions, cut, color, clarity, metal, ring size, setting, taxes, shipping, and warranty. A lower-cost stone in a weak setting is not good value. A balanced ring with a secure setting usually is.
| Stone | Material identity | Mohs hardness | Current Chantal starting point |
|---|---|---|---|
| Moissanite | Silicon-carbide gemstone; not diamond | 9.25 | €1,149 |
| Lab-grown diamond | Diamond grown in a laboratory | 10 | €1,349 |
| Mined diamond | Diamond formed in the earth | 10 | Not sold in the current catalogue |
The listed catalogue starting points were checked on 20 August 2026. The current product selector remains authoritative because stone, carat, gold and size change the final price.
Moissanite
Moissanite is a distinct gemstone, not a diamond. It has strong fire, 9.25 Mohs hardness, and a lower price for visible size. Choose it if brightness, budget control, and a larger look matter more than owning a diamond.
Lab-grown diamond
Lab-grown diamond has the same diamond material identity as mined diamond and scores 10 on the Mohs scale. Choose it if the diamond name, diamond optical character, and grading language matter to you, while still keeping the price below many mined options.
Mined diamond
Mined diamond has the same hardness and diamond material identity as lab-grown diamond, but its origin, supply chain and traditional market positioning differ. Chantal Vaulet does not currently sell mined-diamond rings, so this guide does not invent a store price for them. Buyers who require mined origin should compare an independently graded stone and the complete finished-ring price from a seller that actually offers it.
Sources and methodology
The identity and hardness comparison is checked against GIA's moissanite guidance and GIA's natural-versus-laboratory-grown diamond explanation. Certificate terminology is checked against IGI's diamond-report documentation. Store prices come from the current Chantal Vaulet catalogue, not a third-party market average.
Frequently asked questions
Is moissanite cheaper than lab-grown diamond?
Usually yes. The gap depends on size, cut, quality, supplier, and the final ring setting.
Is moissanite a fake diamond?
No. Moissanite is its own gemstone. It can look diamond-like from a distance, but it has different chemistry and more rainbow fire.
Which is better for an engagement ring?
Moissanite is better for visible size and value. Lab-grown diamond is better if diamond identity is important. Both can be suitable for daily wear in a secure setting.