Moissanite and cubic zirconia are both laboratory-created, both inexpensive relative to diamond, and both frequently sold as the diamond alternative. Commercially they are not interchangeable: they carry different unit costs, different service lives and different customer expectations. Stocking the wrong one in the wrong place is a returns problem waiting to happen.

Specification comparison

Property	Moissanite	Cubic zirconia
Hardness, Mohs	9.25	8.0 to 8.5
Refractive index	2.65 to 2.69	2.15 to 2.18
Dispersion, fire	0.104, very high	0.058 to 0.066, moderate
Typical wholesale unit cost	Mid	Very low
Colour stability	Stable, colour is grown in	Stable, but the surface dulls with wear
Edge retention on faceting	Excellent over years	Abrades and rounds within months of daily wear
Cleaning tolerance	Ultrasonic and steam safe	Ultrasonic safe; steam and harsh chemicals not advised
Certification	GRA common; in-house sheet for melee	Rarely certified individually
Typical retail positioning	Accessible bridal, anniversary, self-purchase	Fashion, costume, gifting, sample lines

Why the durability gap matters more than the price gap

The cost difference between moissanite and CZ is real but small at wholesale, often a few dollars per piece on a silver ring. The service-life difference is large. CZ abrades at the facet edges, and after several months of daily wear the stone reads visibly duller in a side-by-side comparison with a new piece. In a fashion line that is acceptable, because the customer bought a look for a season. In a bridal or everyday-wear line it generates returns and poor reviews.

Use CZ for: fashion and costume lines, trend-led designs with a short shelf life, colour-play designs where the stone is decorative, and photography samples.
Use moissanite for: engagement and bridal, anniversary and milestone gifts, tennis bracelets and eternity bands, and anything marketed as everyday wear.
Do not mix them in one product line without clear labelling. If a customer cannot tell which stone they are buying, the first complaint defines your brand.

Unit cost drivers, line by line

Cost component	Moissanite	CZ
Raw stone material	Moderate, grown over weeks	Very low, high-volume production
Cutting effort	High; moissanite is hard and slow to facet	Low; soft material cuts quickly
Calibrated melee sorting	Significant labour share	Low labour share
Setting labour	Same as CZ	Same as moissanite
Metal cost	Dominates silver pieces	Dominates silver pieces
Certification	GRA per stone above 0.50 ct	Usually none

Note the pattern: on a 925 silver piece, metal and labour dominate. That is why a CZ and a moissanite version of the same ring often differ by less than the customer assumes, and why upgrading from CZ to moissanite is frequently the highest-margin move available on an existing design. You change one line of cost and one line of retail price.

The upgrade path that works

Launch a design in CZ at an entry price to test demand and photography.
If it sells, release the moissanite version of the identical silhouette at a higher price point.
Offer the moissanite version in 10K or 14K gold as a third tier.
Keep the CZ entry piece as the traffic driver and use it to upsell in person.

How to describe both without misleading

Say this	Not this
Laboratory-created moissanite, 9.25 Mohs, GRA certified	Real diamond alternative, with no material named
Cubic zirconia, a fashion stone for occasional wear	Implying CZ will look the same in two years
Identical appearance at a fraction of the cost	Any claim of resale or investment value
Hardness 8.0 to 8.5; remove before swimming or cleaning	Omitting care instructions to avoid a sale objection

Detecting moissanite and CZ in the trade

A standard thermal diamond tester will read moissanite as diamond, because their thermal conductivity overlaps. Two cheap tools solve the problem. A multi-tester that measures electrical conductivity as well as thermal will separate moissanite from diamond reliably. A simple magnifier and a scale of reference stones will separate CZ from moissanite: CZ has noticeably less fire and a slightly softer, more plastic-looking lustre in a side-by-side comparison under the same light.

Test	Diamond	Moissanite	CZ
Thermal tester	Positive	Positive (false positive)	Negative
Multi-tester, electrical	Positive	Negative	Negative
Fire under a point light	Moderate	Very high, rainbow flashes	Low to moderate
Facet edge condition after wear	Sharp	Sharp	Rounded and dulled
Inscription under 10x	Report number	Often none	None

Verify against the certificate inscription rather than relying on any tester alone, particularly on returns and resale. A tester tells you what the material is; the inscription tells you whether the specific stone you are holding is the one that was graded.

Stocking ratio that works in practice

Across the trade accounts we supply, the ratio that performs is roughly 60 to 40 by unit volume in favour of CZ for fashion-led catalogues, and 80 to 20 in favour of moissanite for bridal-led catalogues. The mistake is stocking only one: CZ-only catalogues have no upsell ladder, and moissanite-only catalogues have no affordable entry point for a new customer.

Reading a loose stone supplier quotation

Parcel quotations are quoted either per carat or per piece, and the difference matters when you compare suppliers. Per-carat pricing looks cheaper on small melee because the piece count is high, while per-piece pricing is clearer on larger stones where the carat weight varies. Always ask for both figures on a parcel, plus the total carat weight, so you can normalise the comparison.

Quotation format	Best used for	Watch out for
Per carat	Melee parcels where size is tightly sorted	A wide size range inflates total carat while the average stone shrinks
Per piece	Calibrated melee and single stones	Silence on average carat weight, which hides a lighter parcel
Per parcel	Mixed old-stock lots	No size breakdown at all, so you cannot plan a setting run from it

Three questions turn a loose stone quote into something you can compare: what is the actual measured size range, what is the total carat weight, and what is the piece count. A supplier who answers all three promptly is operationally organised. One who answers only the price is telling you that the parcel documentation will also be thin.

Replenishment planning for a stone supply

Hold one master parcel per specification under your own SKU reference, and grade every reorder against it rather than against the specification sheet alone.
Set the reorder point in carats, not pieces, because your consumption across a production run is driven by total carat weight.
Order melee and centre stones on the same cycle where possible, so a production run is not held up waiting for a single component.
Record the actual size range on every parcel sheet you receive, not just the nominal size. That record is what lets you diagnose a channel that stops seating properly three months later.

Authoritative References

For buyers who need to verify the technical and regulatory basis of this guide, the following independent institutions publish authoritative reference data:

ISO 9001 Quality Management - the international standard for consistent production quality.
Wikipedia: Jewellery - manufacturing processes, materials and global trade background.