893 degrees Celsius. That is where sterling silver turns liquid, and it is the number that divides the techniques on this page into two groups. Casting and electroforming build a piece out of metal that has been melted or dissolved. Stamping, filing, setting and finishing work metal that is already solid. Each technique below costs something different and fails in its own way. the full production sequence from mining to finished piece walks the nine stages in order. how to get your own designs manufactured covers commissioning custom work.
The three forming techniques, compared
| Technique | What it produces | Relative unit cost | Characteristic failure |
|---|---|---|---|
| Lost wax casting | Three-dimensional form, fine relief | Baseline | Porosity, incomplete fill, rough surface |
| Stamping and punching | Surface pattern, letters, symbols | Roughly a third of cast | Doubled or shallow strike from die misalignment |
| Electroforming | Hollow shell, high volume, low weight | Varies with shell thickness | Denting, and dents cannot be worked out |
A quote that comes in far below the others usually reflects a change of technique rather than a change of margin. The table above is how to read that.
Design and prototyping
A piece starts as a drawing. It then moves into CAD as a precise 3D model.
CAD decides manufacturability. Walls too thin to survive polishing. Settings that cannot be cast. Joints that will always show a seam. Catching those on-screen costs nothing. Catching them after casting costs a batch.
Most factories now 3D print a 1:1 prototype from the CAD file before committing. On a custom order it is worth requesting. A physical prototype shows proportion and how the piece sits. A render does not.
Verifying the metal: XRF and fire assay
Incoming metal is checked before anything is made. Two methods do this. They are not interchangeable.
| XRF analysis | Fire assay | |
|---|---|---|
| Method | High-energy X-rays excite the atoms, emitted radiation is read | A sample is melted with flux, cupelled and weighed |
| Destructive | No | Yes, the sample is consumed |
| Speed | Seconds | Hours |
| Equipment cost | High | Low |
| Best for | Screening incoming stock, checking finished pieces | Definitive purity assay, settling a dispute |
Standard practice is to screen with XRF and fall back to fire assay when a figure has to be beyond argument. XRF is also the method available on the buying side: it reads actual silver percentage without marking the piece. how to spot real sterling silver jewelry covers the hand checks that come before a lab. lead and nickel compliance in jewelry covers the separate testing regime for lead, nickel and cadmium.
Lost wax casting
The technique behind most detailed silver jewelry. A wax model is embedded in investment plaster. The flask is heated until the wax burns out completely. Molten metal fills the cavity that remains.
At production scale the waxes are assembled into a tree. Dozens of pieces branch off a central sprue, so one pour produces a batch. That is what makes casting commercial rather than artisanal.
What it buys is detail. Molten metal fills fine relief that nothing else reproduces at the price.
What it costs is expertise. Every alloy flows and shrinks differently. Consistency comes from experience, not from equipment. Porosity comes from trapped gas. Incomplete fill comes from thin sections. A rough surface means the mould was not fully burnt out.
Stamping and punching
A hardened steel die impresses a pattern, letter, number or symbol into metal under pressure. Think of an initial on a signet ring, a shape on a charm, or repeating texture along a bangle.
The two words are used interchangeably on most floors. Where they are distinguished, stamping means a shaped impression into a surface and punching means driving a form through or into the metal. No supplier will misread either term.
This is the cheap technique, and that is its purpose rather than a fault. A stamped piece skips the wax, the mould and the pour. It is faster and cheaper at volume than the same design cast.
The trade-off is depth. Stamping works on relief and surface pattern, not on three-dimensional form. It also demands precision. A die that lands slightly off leaves a doubled or shallow mark, and that cannot be corrected afterwards.
Electroforming
This is what explains a large piece at an implausible weight.
A wax or shaped core is made conductive and suspended in a metal salt solution. A current runs through it. Metal deposits onto the surface over several hours and builds a shell. The core is then removed. The piece is hollow.
That is how sculptural earrings and wide cuffs are produced at a wearable weight. Solid silver at the same dimensions would be too heavy for an ear and too expensive in metal.
The limitation is structural. A hollow shell dents rather than scratches. Once dented it cannot be worked back out, because there is nothing behind the wall to work against. Correct for statement pieces. Wrong for anything that takes daily knocks.
Filing and finishing
Filing removes sprue marks, rough edges and excess metal left by casting. Hand files traditionally, rotary tools now. Still a skilled job, because the shape of an edge is decided here.
Finishing covers the surface treatments that follow. Three of them account for nearly all production, and they turn one casting into three products.
| Finish | Method | Result | Note |
|---|---|---|---|
| Polished | Buffing wheels and tumblers, coarse to fine grades | High mirror shine | The default finish |
| Matte | Fine abrasive driven at the surface (sandblasting) | Even micro-abrasions that scatter light | Sealed cabinet required. Abrasive harms skin, eyes and lungs |
| Brushed | Wire brush heads scoring uniform linear marks | Industrial or worn appearance | Often combined with polished sections for contrast |
Finish is the cheapest differentiation available. The same casting in polished, matte and brushed is three SKUs. The only added cost is the finishing step.
Stone setting
Stones sit in a mount. The mount is usually cast as part of the piece, occasionally soldered on afterwards. Setting means seating the stone and closing the prongs one at a time until it sits level and holds.
This is the most skill-dependent step in the process. It is also the easiest place to see the gap between two factories. A well-set stone sits flat. It holds firm under a fingernail. Its prongs are even in length and do not snag fabric.
A finger run across a sample batch finds the inconsistent ones immediately. That test costs nothing and it is the single most informative check on an incoming shipment.
Plating
A thin layer of one metal deposited onto another by electrolysis. The piece is submerged in a solution rich in metal ions. A current drives those ions onto the surface.
It does two jobs. It changes appearance, putting a gold or rose gold tone onto sterling while keeping the strength and cost of the silver underneath. It also protects. Rhodium in particular puts a hard tarnish-resistant barrier between silver and air.
Electroplating is not the only method. ion plated stainless steel jewelry covers ion plating, which bonds the layer inside a vacuum and lasts considerably longer. the plating types we offer lists the finishes available across the range.
Reading a quote with all of this
When two quotes for a similar-looking piece diverge sharply, the technique is usually the reason.
- Much cheaper and flatter looking: stamped rather than cast. Correct for surface pattern. Wrong if dimensional form was specified.
- Much lighter than it looks: electroformed. Correct for statement pieces. Wrong for anything worn hard.
- Similar price, visibly better edges and stone seats: the difference is filing, finishing and setting labour. That is where the money goes in a good factory.
- Cheapest of all, colour slightly off: check whether the quote is plated base metal rather than plated sterling.
- A supplier who cannot name the techniques a piece uses is not making it. That question separates manufacturers from trading companies faster than any other.
Frequently asked questions
What is the most common jewelry manufacturing technique?
Lost wax casting. A wax model is embedded in plaster, the wax is burnt out, and molten metal fills the cavity left behind. At production scale the waxes are assembled into a tree so one pour produces dozens of pieces. It is the standard method for detailed silver jewelry because molten metal reproduces fine relief that no other technique matches at the price.
What is the difference between cast and stamped jewelry?
Casting pours molten metal into a mould, producing three-dimensional form and fine detail. Stamping presses a hardened steel die into metal to impress a pattern, letter or symbol onto a surface. Stamping is faster and cheaper at volume because it skips the wax, mould and pour entirely, but it works on relief and surface texture rather than dimensional shape.
What is electroforming in jewelry?
A technique that builds a hollow metal shell by depositing metal onto a conductive form suspended in a metal salt solution, using an electric current, over several hours. The core is then removed. It is how large sculptural earrings and cuffs are made light enough to wear and affordable in metal. The limitation is that a hollow shell dents rather than scratches, and dents cannot easily be worked out.
How do manufacturers test whether silver is genuine?
Two techniques. XRF analysis uses high-energy X-rays to read the chemical composition without damaging the piece, which makes it suitable for screening incoming stock and checking finished goods. Fire assay melts a sample with flux and weighs the precious metal recovered, which is definitive but destroys the sample and takes hours. Factories screen with XRF and use fire assay when a figure has to be beyond dispute.
Buying from a factory that runs all of this
Every technique here has its own cost and its own way of failing. Ask a supplier which ones a piece uses. Naming them is a claim that they make it. Not naming them is also an answer.
ELF925 runs design, casting, stamping, setting, finishing, plating and quality control under one roof at our Thailand factory. Browse the ELF925 wholesale jewelry collection with a 99 USD minimum order and free worldwide shipping over 499 USD.
