Inside the Wuzhou Workshop: Nine Steps from Render to Parcel

The workshop sits on an upper floor of the Wuzhou Jewelry E-Commerce Building, 8,000 m² of bench space, casting rooms and offices. The building has a particular sound on a weekday morning: the low hum of dust extraction, the ring of a hammer on a mandrel somewhere down the floor, and the periodic hiss of a torch. Here is the route a ring takes from an approved render to a sealed parcel.

1. CAD

Every custom piece starts as a file. Our designers work from your measurements, your reference images and the stone you have chosen. The model is built to the actual dimensions of the actual stone, because a setting modelled around a nominal 6.5 mm stone and then set with a 6.3 mm one will not hold.

The first render goes out for your approval. You look at it on a screen, we adjust, and the file is frozen only when you reply in writing that it is right. This is the cheapest moment to change your mind and the last one before metal.

2. Wax printing

The frozen file goes to a resin printer. A ring prints in a couple of hours, layer on layer, in a translucent amber material. The printed model is washed, cured under UV, and inspected under a loupe for layer lines and support marks. A rough print becomes a rough casting, so the model is checked before it leaves the printer room.

For pieces with fine detail — milgrain, filigree, a claw that tapers to a point — we may print larger and cast in a different tree position, or cut the wax by hand from a block. Some shapes print badly no matter how good the file is.

3. Casting

The models are sprued onto a wax tree, invested in a plaster cylinder, and burned out in a kiln overnight. The kiln room is the hottest place on the floor. In the morning the cylinder is a hollow mold, and molten metal goes in — by vacuum or centrifugal casting depending on the alloy and the thickness of the piece.

18K gold and PT950 platinum cast differently. Platinum needs far more heat and a different investment; it is cast in smaller batches and quenched in its own way. The tree comes out of the cylinder gray and rough, still attached to its sprue.

4. Filing and pre-polish

The piece is cut off the tree, the sprue stub is filed flush, and the rough surface is taken down with progressively finer abrasives. This is where a casting becomes an object. Edges are trued, the inside of the shank is cleaned up, and any porosity at the surface is found — a pit that shows now is a pit that would show after polishing, so it gets addressed here rather than hidden.

5. Setting

Setters work under a microscope at benches with strong task lighting. Each stone is seated, the prongs or beads are pushed over it, and the stone is checked for movement with a probe. A pave run is set one stone at a time; a large center stone is set in a seat that was cut to its actual girdle.

This is the slowest stage and the one that decides whether the piece survives a decade of wear. Every stone in a finished piece has been pushed, tested and looked at.

6. Polishing

Polishing happens in a separate room with its own extraction, because the compound and the dust go everywhere. The piece is polished in stages — coarse, medium, fine — then cleaned in an ultrasonic bath and steamed. Between stages the setter's work is masked or avoided so a polishing wheel does not catch a prong.

7. Plating

White gold goes into a rhodium bath for its final color. The piece is cleaned, dipped, rinsed and dried, and the plating thickness is kept even so the color does not go patchy at the edges. Platinum and yellow or rose gold skip this step; their color is the metal.

8. QC

Every piece is inspected against the approved render: metal, size, stone count, stone color match, setting security, plating coverage, engraving text. Ring size is checked on a mandrel, not by eye. Weight is recorded. A piece that fails goes back to the bench that caused the problem, not to a general queue.

9. Packing

The piece is cleaned once more, photographed for our records, and packed in its box with any certificate. The parcel is weighed, the commercial invoice is prepared with an accurate description and value, and the tracking number is issued. At that point the piece stops being ours.

Nine steps, and the ones that matter most are the quiet ones — the loupe check on a print, the probe against a stone, the mandrel. If you want to see how the process maps onto your own order, the how it works page follows the same sequence from your side of it.