Jewelry quality control — how to accept a batch from your manufacturer

You cannot challenge a feature nobody described in advance. "It should be nicely polished" is not an acceptance criterion — "mirror polish, no visible scratches when inspected from 30 cm" is.

Before production starts, write down four things: metal and hallmark standard, surface finish, type and thickness of the plating, and acceptable deviations in weight and dimensions. One page of A4 that later replaces long arguments.

The most effective control tool is not a table but a physical reference piece — a unit from the first run approved by the brand, kept both at the manufacturer and at the client. Every later batch is compared against it.

The reference settles what no number can capture: the shade of gold plating, the depth of oxidising, the character of a satin finish. Without it a dispute about plating colour cannot be resolved, because both sides are right under their own lighting.

Split the inspection into several independent checks:

• quantity and weight — pieces and total batch weight against the order;
• dimensions — ring size, chain length, earring diameter;
• surface — casting porosity, grinding marks, sprue remains;
• plating — colour consistency across the batch, no breakthrough on edges;
• moving parts — clasps, hinges, hooks: function and spring force;
• stones — secure setting, symmetrical prongs, no movement;
• marks — assay mark and maker's mark where required.

Packaging and labels deserve a separate look. In retail they create the first impression, and an error on the tag — wrong standard, a typo in the model name, missing material information — can block an entire batch in store even though the item itself is faultless.

Jewelry is cast and hand-finished, so identity down to a hundredth of a gram does not exist. In practice a weight deviation of a few percent is accepted for small parts and less for heavier items — the exact figure is agreed before production, after the first trial cast.

The same applies to electroplating: thickness is given in microns as a range, not a single number. Plating deposits unevenly on edges and in recesses — that is the physics of the process, not a defect.

Agree in advance under what conditions colour is judged. The same gold-plated bracelet looks different in daylight, under a warehouse fluorescent tube and under a warm shop lamp. When both sides inspect under the same light and next to the reference piece, disagreements largely disappear.

With a batch of several hundred pieces, inspecting every one is a cost that still will not catch everything. The standard is sampling by quality level: a random sample from the batch, an agreed number of acceptable minor defects and zero tolerance for critical ones.

A critical defect makes the item unsellable or unsafe — a crack, a sharp edge, a failing clasp, a loose stone. A minor defect is, for example, a barely visible polishing mark in a spot invisible once worn.

The report does not need to be elaborate. Date, order number, pieces in the batch and in the sample, a list of defects split into critical and minor, photos, and a decision: accept, accept conditionally, or return for rework.

Timing is the key. A complaint raised a week after delivery is indisputable — after three months you can no longer separate a production defect from damage in the warehouse or at the end customer. Agree an inspection window in the contract and actually keep to it.

In our experience most complaints have three sources: vaguely specified finishing, a change of component supplier mid-run, and rush at the polishing stage before a shipping deadline. All three are removed by planning, not by inspection.

That is why for ongoing cooperation we propose a technology sheet per design — a record of casting, finishing and bath parameters that keeps later runs identical. If you are planning a permanent collection and want acceptance criteria set for your range, write to us.