Last updated: October 2026
By Jack Lv, General Manager — 925 sterling silver and GRA moissanite manufacturing in Foshan since 2011
Vet a moissanite factory on documents rather than on samples: confirm the legal entity and how long it has operated, confirm the plant and production lines are its own, ask for numbered test reports you verify directly with the issuing laboratory, and put MOQ, tier pricing, lead times and third-party inspection rights into the contract before any deposit is paid.
A trading company is not automatically a bad supplier, but you should know which one you are buying from, because it decides who controls the lead time, the quality decisions and your design confidentiality.
| Signal | Points to a factory | Points to a trading company |
|---|---|---|
| Site access | Offers a live, unedited walk-through of one building, or a dated tour you can repeat | Sends a clip that never shows two rooms in one continuous shot |
| Process answers | Explains plating, setting and QC stages in its own words, including what goes wrong | Answers in sales language and deflects technical questions |
| Test reports | Knows the issuing laboratory, the reference and the scope it covers | Sends a generic file that names neither your models nor a verifiable record |
| Pricing behaviour | Quotes against a fixed MOQ and tier schedule and holds it | Quotes one price, then negotiates case by case with wide swings |
| Sampling | Builds your design from CAD and explains what the sample cost covers | Quotes fast but cannot say who physically makes the sample |
| Payment details | Bank account name matches the registered entity and licence | Personal account, or a name unrelated to the licence |
Once the documents check out, buy the smallest thing that proves the relationship. For a factory working to a ten-piece minimum per design, that usually means one design, sampled and then produced, with the tier schedule agreed first: ten pieces at the baseline price, a stated reduction at fifty pieces and a further reduction at one hundred.
Budget the calendar around real production windows rather than a courier promise, and expect a quotation within one working day so competing suppliers can be compared on the same brief. Pay by T/T or the platform you already use, and choose DDP or DDU if you would rather not manage freight. Then inspect before shipment and release the balance when the report lands, which is the cheapest insurance on a trial order.
A well-run exporter can produce, on request, a business licence, third-party test reports with references you can verify, an audit certificate with a stated validity period and per-stone grading documents. For reference, our own file includes a REACH SVHC report, Shenzhen BKC Testing reference BKC25020516BR dated 27 February 2025, showing all 247 listed SVHCs below 0.1 percent; a RoHS and CE certificate, Shenzhen HyCert reference HYC2025120053RV1 dated 31 December 2025, covering the 27 models it lists under RoHS 2011/65/EU and its amendments, tested with IEC 62321 series methods; and an Intertek factory audit certificate, reference 483553466_T, valid from 31 December 2025 to 30 December 2026. Nabest is the brand of Foshan Nameituo Jewelry Co., Ltd., founded in 2011 in Foshan, Guangdong.
Treat all of that as a starting point rather than a conclusion: every numbered report should be verified with the laboratory that issued it, and every claim should map to a model, a batch or a date.
A live video call with a continuous walk-through, plus a third-party inspection on the first shipment, covers most of what an initial visit would. Save the flight for the second order, once you know which details matter.
Take the reference number and the issuing laboratory, then verify through that laboratory's own channel. Confirm the standard, the date, the model list and the scope. A file that cannot be resolved to a record is only a document.
It is workable: it lets you test a design without a container-load commitment. What matters more is that the tier schedule is published, so fifty and one hundred pieces are priced consistently instead of renegotiated as you scale.
Yes, and a factory serving private-label brands will expect it. If the answer is evasive or conditional, treat design protection as absent and do not send original artwork, tooling files or customer lists.
Charging is normal because the work is real. What matters is that the cost is stated before you agree, that the sample matches production, and whether the charge is credited against the bulk order.
Send your design, size and quantity — factory quote back within 24 hours. Reference: General enquiry