A boutique owner holding a finished ring in hand rarely sees the handoffs behind it. A jewelry factory is not one jeweler working end to end; it is a sequence of specialized stations, each owned by technicians who do that one step all day. Understanding the line helps buyers ask sharper questions about lead time, capacity, and where delays actually originate.
Intake and design lock
Every order, whether a one-off custom or a 300-piece replenishment, opens as a technical package. The factory needs a CAD file, a hand sketch, physical reference, or a clear photo, plus notes on metal, karat, stone sizes, finish, and the sizing distribution across the run. This intake step is where the majority of later defects are either prevented or built in. If the design team under-specifies wall thickness or leaves a prong too thin, the casting team discovers it only after the flask is already poured, and rework at that point costs ten times what a CAD revision would have cost.
For custom work, a CAD designer models the piece in software and sends rendered images from three angles for written approval. For repeat SKUs, the factory pulls the master wax or the production rubber mold from storage and confirms the spec sheet matches the current order before anything hits the press. A SKU that has been in production for years still gets a quick mold-wear check, because a tired mold starts to lose sharpness at high points.
Model making and the mold room
Once the design is locked, the model room produces the physical pattern. In modern shops this means a 3D-printed wax; in older runs it means a hand-carved wax or a machined master. For styles that will be reordered, the approved master goes into the vulcanizing press to make a production rubber mold. That mold is the asset that lets a factory pull ten waxes a day from the same design without re-modeling it. Mold wear is tracked on a log: a mold that has produced several thousand waxes begins to soften engraving and fine detail, and the factory retires it before customers start receiving pieces with blurred lettering.
Casting as a batch operation
Waxes are injected, inspected for flash and distortion, and sprued onto a tree. The tree is invested in a ceramic flask, burned out in a kiln, and cast under vacuum or centrifugal force. The metal, either recycled in-house or freshly alloyed, is melted at the temperature the karat requires and poured. After cooling, the flask is quenched, broken out, and the cast tree is separated from its sprues.
Casting runs in batches, which is why factories quote lead times in weeks rather than days. A single flask may hold 40 rings or 150 pendants; the schedule depends on how many orders share the same metal and color. A lone yellow-gold ring inserted into a silver casting day will sit until the next compatible flask is built. This batching logic is the single biggest reason lead times slip when buyers swap metals mid-order.
Finishing is where quality is decided
Raw castings are rough, orange-skinned, and covered in sprue marks. The finishing department grinds those off, sands through a progression of abrasives, and brings the piece to a pre-polish. This is the most labor-heavy stage in the building, and the one where a factory's quality shows most clearly. Two factories can cast the same CAD and deliver visibly different products based purely on the finishing minutes allocated per piece. A shop that budgets six minutes a ring will look cheaper in the catalog; the same CAD budgeted twelve minutes looks like a different product.
Stone setting and final assembly
Finished mounts move to the setter's bench. Stones arrive sorted by size and position; setters work under magnification, tightening prongs or bezels by hand or with a laser welder for micro-work. After setting, the piece returns for a touch-up polish to remove handling marks from the bench. This return trip is non-negotiable: bench handling leaves fine scratches that show up under store lighting even when they are invisible to the naked eye.
QC, plating, and packing
Final inspection checks dimensions, prong tightness, finish, stone security, and engraving legibility. Pieces that need rhodium or color plating go to the plating line before a second QC pass. The order is then tagged, sized, and packed for shipping. A well-run shop photographs the final batch before sealing the carton, so a disputed shipment can be resolved against the record rather than a promise.
What to ask on a factory audit
When you vet a supplier, ask which of these stations are in-house and which are outsourced. A factory that farms out casting or setting will carry longer lead times and less direct control over defects. Ask also for a sample routing sheet for your SKU: it names the stations your piece touches, in order, and shows where the bottleneck sits. You can see how we handle routing and capacity on our manufacturing guides.
Carat weight conventions cited here follow the Wikipedia entry on carat weight.
Frequently Asked Questions
How do I verify a factory before placing a bulk order?
Request a production video, business license, export records and a paid sample run. A factory that accepts a 50-piece test order is usually a real manufacturer.
What payment terms do you offer?
30% T/T deposit with the balance against the bill of lading. This protects both sides on first orders and can move to net terms after a track record.
What is your normal reject rate?
3–5% under 10x loupe inspection for cast and set pieces. Defective units are replaced free in the next shipment.
Where is the factory located?
Wuzhou, Guangxi, China—the core lab-grown and moissanite manufacturing cluster. Shipments go via Guangzhou or Shenzhen ports.
