A brand in Melbourne took a supplier's website at face value, sent over a CAD for a 1.5-carat oval moissanite halo ring, and received 30 pieces where the halo sat asymmetrically on every single one. The factory could render a CAD; it could not cast and set to tolerance. A custom jewelry factory audit — even a remote one — catches exactly this gap before your deposit moves. Below is the 12-point checklist we hand to every serious buyer.
What an audit actually protects you against
The three failure modes in custom jewelry are: (1) the supplier is a trading company, not a maker; (2) the maker is real but cannot hold your tolerance; (3) the maker can hold tolerance once but cannot repeat it across 500 pieces. Each of these has a fingerprint you can detect on a checklist.
The 12 audit points
- Ownership of equipment. Ask for photos of the furnace, castable 3D printer, laser welder and plating bath with a dated handwritten sign. Trading companies do not own these.
- XRF alloy verification. Every alloy lot should have an XRF strip. Refuse a supplier who only assures you "it is 925".
- Tooling ownership clause. Your CAD files and production moulds must remain your property. Get this in writing before tooling is cut.
- Past custom portfolio. Ask for three references in your product category, not generic best-sellers.
- Setter skill mix. Count how many bench jewellers are full-time setters versus generalists. Pavé work needs specialists.
- Plating thickness logs. Coulometric gauge readings per shift. Anything under 0.3 µm rhodium will yellow in 3 months.
- QC rejection rate. Ask for the last 90 days of line rejects. A healthy number is 2–4%; "zero" is a lie.
- Certification capability. For moissanite, confirm GRA certificate issuing; for diamond, IGI or GIA loose-stone handling. Certification should arrive with the parcel, not after.
- Export documentation. Ask to see a commercial invoice, packing list and HS code set from a recent EU or US shipment. Errors here kill goods at customs.
- RMA and defect window. Get the written defect warranty. We honour a 30-day defect RMA with a re-make or credit, not a vague "we take care of it".
- Data and file security. Your CAD files should be deleted or returned after production, not reused for other buyers.
- Communication language and timezone. A real factory replies in 24 hours on working days with photos of your WIP, not once a week via a sales intermediary.
Side-by-side: real maker vs trading shell
| Checkpoint | Real maker | Trading shell |
|---|---|---|
| Floor photos | Same benches on every visit | Stock images or changing backdrops |
| XRF records | Produced on request, dated | "We trust our alloy supplier" |
| WIP photos | Of your exact SKU, daily | Generic process shots |
| Lead time slips | Explained by zone | "Shipping delay" |
| Reject rate | 2–4%, root-caused | "We never have rejects" |
Run the audit at the right depth for your order
Small opening orders (under 300 pcs): run points 1, 2, 3, 8 and 11 by email and video. That is enough to filter out shells. Spend the saved money on a physical sample before bulk.
Boutique private-label programs (300–2,000 pcs): run all 12 points, plus request two customer references in your market. A phone call to a fellow buyer beats ten websites.
Brands at 5,000+ pcs/month: commission a third-party on-site audit (SGS/ITS). It costs roughly USD 400–600 and is paid back by the first avoided defect batch. Ask also for an ISO 9001 certificate scope check — the scope line matters more than the logo.
Frequently Asked Questions
Can I audit a jewelry factory without flying in?
Yes. A structured video walkthrough covering the 12 points, with dated WIP photos of your sample order, catches the vast majority of trading shells. On-site audit is reserved for orders above 5,000 pieces.
How long should a remote factory audit take?
A focused remote audit takes one 90-minute video call plus 2–3 rounds of document follow-up. Plan one to two weeks from first request to a decision.
What is the most common audit red flag buyers miss?
The missing tooling-ownership clause. Without it, your custom CAD can legally be reproduced and sold to your competitors by the same factory.
Does ISO 9001 certification mean a factory is good?
Not by itself. Read the scope line on the certificate; a valid certification covers jewelry manufacturing specifically. A generic trading-entity scope is cosmetic.
Should I ask for customer references?
Always. Ask for two references in your product category and market. A supplier who refuses references after you have paid a sample deposit is telling you something.
Key takeaways
- Audit equipment ownership, not just the website.
- Lock tooling ownership and file security in writing before cutting moulds.
- Demand XRF strips, plating logs and a real reject rate — not assurances.
- Scale audit depth with order size; third-party audits pay back above 5,000 pieces.
Next step: request our audit pack — equipment list, last-90-day QC log, sample export docs — before your first deposit. MOQ 20 pcs per SKU.
Related reading: manufacturing guides, OEM manufacturing, private label factory, and the wholesale factory tour checklist.
For HS classification of jewellery in customs and export documentation, the WCO Harmonized System nomenclature is the authoritative nomenclature.
Authoritative References
For buyers who need to verify the technical and regulatory basis of this guide, the following independent institutions publish authoritative reference data:
- FTC Advertising FAQs - U.S. guidance on truthful marketing and disclosure.
- Wikipedia: E-commerce - online retail and marketplace background.
