Cubic Zirconia vs Moissanite: Which Sparkle Should You Buy?

The short answer

Cubic zirconia (CZ) and moissanite are the two simulants behind almost every affordable "diamond look" piece in this catalogue, and they are not the same material at all. CZ is cheaper and glassier-looking; moissanite is harder, brighter, and priced a step up as a result. If you want the lowest possible price for occasional wear, CZ does the job. If you want something that holds up to daily wear and looks closer to a real diamond, moissanite is worth the extra.

What each one actually is

Cubic zirconia is a synthetic crystal form of zirconium dioxide, grown in a lab specifically to imitate diamond — it has no other real-world use. Moissanite is silicon carbide, also lab-created for jewellery today, but it was originally discovered as a natural (if vanishingly rare) mineral, first found in a meteor crater in the 1890s. Neither is "fake" in a dishonest sense; both are genuine, named materials with their own chemistry, just not diamond. Knowing the actual name behind the sparkle helps you read a listing correctly instead of assuming every clear stone is the same thing.

Sparkle and colour

Moissanite has a higher refractive index than both diamond and CZ, so it throws more coloured fire — those flashes of rainbow light you see as a piece catches the light. CZ is brighter than you might expect but tends to look a little more "glassy" and one-dimensional by comparison, especially in direct sun or under warm indoor lighting. Some buyers actually prefer CZ's calmer, whiter sparkle for that reason — moissanite's rainbow flashes can read as a touch too flashy in a very large stone, so it genuinely comes down to taste as much as which one is "better".

Durability: the real gap

This is where the two materials genuinely diverge. Cubic zirconia sits at around 8–8.5 on the Mohs hardness scale; moissanite is about 9.25, second only to diamond. In practice that means CZ scratches and dulls faster with everyday knocks — keys, countertops, other jewellery, even fine grit in a handbag — and those micro-scratches are what makes a CZ stone look cloudy or "dead" after a year or two of regular wear, even though it started out bright. Moissanite resists that same wear and keeps its edge and brilliance for years. For a piece worn occasionally or kept for special occasions the difference barely shows; for something worn daily — a pendant you never take off, a ring — it adds up fast, and CZ pieces in heavy rotation often need replacing well before a moissanite equivalent would.

Price: what you're actually paying for

Cubic zirconia is the cheapest simulant available, which is exactly why it shows up in the lowest-priced pieces across this catalogue — full pavé pieces can be made for very little because the stone itself costs almost nothing. Moissanite costs more to produce and is priced accordingly — still a small fraction of a real diamond, but a genuine step above CZ, sometimes several times the cost for a comparable size. Treat that price gap as buying durability and sparkle quality, not just paying more for the same thing; if budget is tight and the piece is a fashion accent rather than a daily-wear centrepiece, CZ remains a perfectly sensible choice.

How to tell them apart in a listing

Listings don't always spell it out clearly, so use price and wording as your guide: if a stone-set piece is priced at only a few dollars, it's almost certainly CZ — moissanite rarely comes that cheap even in small accent stones. Terms like "AAA cubic zirconia", "CZ pavé" or simply "zircon" mean exactly what they say; "moissanite" should be named explicitly if that's what you're getting, often alongside a carat-equivalent size. When a listing is vague about the stone and the price is very low, assume CZ rather than take a generic "diamond-look" description at face value.

Caring for each stone

Both clean up the same simple way: warm water, a drop of mild dish soap and a soft brush, then dry with a lint-free cloth. Avoid ultrasonic cleaners on older CZ pieces where the setting may be glued rather than prong-set, since vibration can loosen the stone. Store both away from other jewellery that could scratch the surface, and take rings and bracelets off before cleaning, gardening or gym work — the setting, not just the stone, is usually what fails first on a budget piece.

Which should you buy?

Buy CZ for a piece you'll wear occasionally or rotate through a large collection, where absolute lowest cost matters more than longevity — costume jewellery, statement pieces for a night out, or anything you're not fussed about wearing for years. Buy moissanite for anything you want to wear daily and have still look good in a year or two: everyday chains, pendants and pieces that get real use. Neither is trying to fool anyone into thinking it's a diamond; pick based on how hard the piece will actually work for you, and budget the difference in price against how often it'll be on your body.