A moissanite listing promises "factory direct," the price is 18% below market, and the sales rep offers GRA certificates on every stone. Three weeks later the stones arrive cloudy, the girdle inscriptions do not match the reports, and the rep's phone goes quiet. You bought from a trader re-selling another factory's offcuts — or worse, from a re-stamping operation. Here is how to tell the difference before you pay.

What a real moissanite factory looks like

Real moissanite supply splits into two tiers. Growth houses (synthesis crystal growing) are capital-intensive plants — there are a handful of them in China and the US. Cutting and polishing factories buy rough, cut it, laser-inscribe girdles and issue reports. 90% of B2B buyers deal with the second tier. A real cutting house shows: cutting benches in the video call, diamond-bladed faceting machines, a laser inscription station, and a cleaning/QC room. Ask for a same-day video tour of all four rooms — not a brochure video. A trader will show you one display case and a stack of certificate folders.

Document and price signals

Request, before any deposit: (1) business licence with scope including "gem processing" or "crystal synthesis," (2) three finished-stone photos of the same lot under 10x loupe with visible girdle inscription, (3) the GRA report number for that lot, (4) a sample order of 2-5 stones. Then run the price sanity check: if their price is more than 15% below the verified market sheet for the same carat/color/clarity, they are either selling inclusion-heavy material, re-stamping used reports, or mixing diamond simulants. Read GRA vs IGI vs GIA so you know which paper you actually asked for.

The sample-order test that ends the debate

Buy 3-5 stones (USD 60-200 landed) and send one to an independent gemologist for refractive-index and thermal-conducivity testing. Moissanite has a distinct RI near 2.65 and a doubled refractive index under the loupe; a trained eye separates it from diamond, CZ and white sapphire in ten minutes. If the stone passes and the girdle number matches the report, you are dealing with a credible cutting house. If it fails, you saved yourself a USD 10,000 order. After the sample passes, structure the first production payment with escrow — see TT vs escrow vs LC — and keep MOQ modest, per small-buyer MOQ leverage.

Red-flag checklist

Refusal of a same-day video call, or always "camera broken."
Certificate numbers that fail verification on the lab channel.
Prices 20%+ below market with no explanation of the grade.
Company name on the invoice differs from the licence and from the payee bank account.
Marketing claims of "GIA-certified moissanite" — GIA does not grade moissanite (see GIA 4Cs documentation); anyone saying so either misunderstands the trade or misleads.

For finished jewelry lines (settings + stones), the same vetting applies to the setting factory — cross-check with the general factory audit. And before you stock, align the shapes and sizes with what retail is actually buying: see the 2026 trends guide.

How much moissanite to buy on the first verified order

Once a supplier passes the sample test, do not reward the win with a 5,000-stone bulk buy. Start with 200-400 stones across two shapes (round and one oval or cushion) in the D-F VVS band, matched to the settings you already sell. This is enough to fill two retail windows, enough to catch any batch drift in plating or setting, and small enough that a wrong call costs under USD 3,000. Verified cutting houses usually hold stock in the popular sizes, so a reorder of 1,000 stones can ship in 7-14 days — the whole point of verification is that you no longer need to pre-buy half a year of inventory to feel safe.

FAQ

How much does a sample-order test cost?

USD 60-200 for 3-5 stones plus USD 30-80 for an independent gemologist check. It is the cheapest step in supplier vetting — cheaper than one disputed bulk shipment.

Can a trader still be a good supplier?

Yes, but they must be transparent about being a trader, price accordingly (usually 5-10% above factory), and stand behind quality disputes. The problem is a fake "factory" — same brand, no production floor, no rework ability.

What carat sizes should we sample first?

1.0 and 2.0 carat D-F VVS rounds — the most common inventory. If those pass, the cutting house is real; specialty shapes can follow on the reorder.

Do moissanite factories issue FTC-compliant stone disclosure?

They should. Under 16 CFR 23, moissanite must be disclosed as moissanite. A supplier offering generic "white stone" descriptions is asking you to build a compliance problem into your retail tags — decline.

HOLYCOME operates its own moissanite cutting and inscription line in Dongguan. We do same-day video tours, ship 3-stone sample packs with girdle photos, and provide GRA report verification per lot. Request the sample pack and current price-per-carat sheet.