Most quality failures and missed deadlines are not bad luck. They are the result of questions that nobody asked before the contract was signed. A few targeted conversations at the start of a partnership with jewelry manufacturer can prevent the majority of supply chain headaches down the road. You can think of it as pre-contract due diligence.
Production and Capacity Questions to Ask Any Jewelry Factory
Before a single piece goes into production, you need a clear picture of what the jewelry factory can actually handle at scale and under pressure.
“What is your monthly output capacity, and how is it allocated across clients?”
A factory might quote 500,000 units per month, but if 80% of that capacity is locked into three anchor clients, your order is already competing for scraps. Ask for a specific number, and then ask how much of that is genuinely available.
“What are your standard production lead times, and how do they change in peak seasons?”
Lead times in January are not the same as lead times in October. Any jewelry manufacturer worth working with should be able to give you honest, differentiated answers for peak and off-peak periods. Vague answers here are a red flag.
“Do you subcontract any part of production?”
This one catches a lot of brands off guard. Some factories subcontract polishing, stone-setting, or plating to third parties, and that third party is not in your contract. Ask which processes stay in-house and get them documented.
“What machinery do you operate, and what surface treatments can you apply?”
For brass jewelry, the core question is whether they run in-house electroplating lines (gold, rhodium, antique finishes) and what thickness they can guarantee.
For stainless steel, ask specifically about PVD (Physical Vapor Deposition) capability. PVD produces harder, longer-lasting color finishes than standard electroplating, and not every demi fine jewelry manufacturer has the equipment for it.
A factory with proprietary plating technology and documented thickness testing (such as X-ray fluorescence verification) is a far more reliable partner than one that sends work to an outside plating shop.
Quality and Compliance Questions for Custom Jewelry Manufacturing
Quality promises are easy to make. Verifiable processes are what actually protect your brand.
“Walk me through your quality control process from raw material to shipment.”
You want a step-by-step answer here, not a marketing summary. A credible custom jewelry manufacturing partner should be able to describe incoming material inspection (spectrometer testing for material purity is standard at serious factories), in-process checks at each production stage, pre-plating and post-plating verification, finished product inspection, and a final pre-shipment check.
“What is your defect rate, and how do you measure it?”
Industry benchmarks for fashion jewelry typically sit around 1–3% defect rates. A well-run factory with rigorous in-house QC should be operating below that. Ask for documented data, not just a verbal assurance. Ask how defects are classified and whether the rate covers cosmetic issues, structural failures, or both.
“What certifications do you hold?”
At minimum, look for ISO 9001 (quality management), RJC (Responsible Jewellery Council), and SGS certification. They represent third-party-audited commitments to ethical sourcing, process standards, and material safety. If a factory claims compliance with EU REACH or ASTM F2923 (nickel release standards relevant for the US children’s market), ask for test reports to back it up.
“How do you handle rejected goods or batches that fail inspection?”
A good answer includes a defined replacement policy, a documented root cause analysis process, and a clear timeline. The speed and structure of their response to this question tells you a great deal about how they handle problems when real money is on the line.
Commercial and Legal Questions Before You Sign
The most overlooked part of pre-contract due diligence is the legal and commercial structure of the relationship.
“What are your standard payment terms and deposit requirements?”
Most factories in China require a 30–50% deposit before production begins, with the balance paid before shipment. That is reasonable. What you want to watch for is whether the terms leave you with any leverage if quality issues arise before final payment. Structure matters.
“Who owns the tooling and molds created for my designs?”
This is a non-negotiable point for any brand serious about custom jewelry manufacturing. If you pay for the molds, you should own them — and that ownership should be explicit in the contract, not assumed. Some manufacturers retain mold ownership as a way to lock clients in. Do not let that go undiscussed.
“Does the contract include IP protection and confidentiality clauses?”
Your design files, CAD drawings, and product concepts are proprietary assets. A manufacturer with a serious approach to OEM relationships should have standard NDA language available. If they resist or seem unfamiliar with this request, that tells you something.
“How are disputes resolved, and under which jurisdiction?”
International contracts should specify the governing law and the dispute resolution mechanism, whether arbitration, mediation, or litigation. If this is left vague, you may find yourself without a practical remedy if things go wrong.
The Right Partner Goes Beyond the Contract
A well-structured contract sets the floor for a relationship. What determines the ceiling is how well you communicate once production actually starts.
Regular production updates, fast responses to design changes, and a manufacturer who treats your brand’s success as their own — these things cannot be written into a clause, but they are what actually differentiate good partnerships from great ones.
Star Harvest has spent over 20 years working with global jewelry brands as a dedicated OEM&ODM jewelry manufacturer. Their factory can produce 500,000+ pieces per month with a 97% on-time delivery rate.
For surface treatments, they offer various electroplating and PVD options across brass and stainless steel, backed by seven self-developed plating patents. Certifications include RJC, SGS, and ISO. Every client is assigned a dedicated cross-functional team for engineering, production, and QC support.
Ask the right questions before you sign. Then find a manufacturer whose answers actually hold up.
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