A buyer in Stockholm received a 200-piece shipment and photographed one ring against a white wall. The product shot looked fine. The wall reflection showed a long, faint scratch across the shank that had missed the bench. Every individual loupe check had passed; the scratch was invisible head-on but screamed at 45 degrees. Final visual inspection is a discipline on its own, and it is the last gate between our bench and the customer. Here is the table we use.
Why a loupe is not the last check
A 10x loupe looks at one 5 mm area at a time. It catches prong tips, solder seams and stone chips. It cannot judge the whole surface: a haze that covers the whole shank, a reflection that bends because the band is slightly asymmetric, compound dried in a gallery channel. Those defects show up only when you hold the whole ring at an angle under a long, even light source and watch the reflection move. We run loupe QC at the bench, then a separate visual inspection at 45 degrees before packing.
Read the loupe-side step in our loupe and ultrasonic check, the wider program in the full order QC checklist, and the photo delivery in QC photos before shipment. For US-bound brands, inspection standards align with the FTC Guides for the Jewelry Industry in 16 CFR Part 23, which require honest finish and material representation.
The angled-light table routine
Set the light
We use a 1.2 m long 5,000 K LED bar mounted at 45 degrees above a matte grey table. The inspector holds the ring by a gloved finger and rotates it slowly through a full 360. A true high polish throws one long, straight reflection; a haze scatters it; a scratch writes a dark line in the reflection. The inspector is looking at the reflection, not the metal.
Check the whole piece, front and back
We rotate the ring through the face, the shank inside, the gallery and the basket. Each pass takes about 10 seconds. Anything that breaks the reflection goes back to the bench. We also check symmetry at this stage: a solitaire head that sits 0.5 degrees off-center shows up as a bent reflection long before a caliper measures it.
Ultrasonic residue check
After the light test, the inspector runs a cotton swab under the gallery rails and inside the shank. Any rouge dust or compound on the swab means the ultrasonic cycle was too short. The piece goes back for a 60-second clean. This catches the looks-clean-but-feels-dusty defect that customers notice in person.
| Defect | Caught by | Reject rate held |
|---|---|---|
| Stone chip / prong issue | 10x loupe | <0.5% |
| Haze / polish wave | Angled light | <1% |
| Missed compound | Cotton swab | <0.5% |
| Asymmetry | Reflection check | <0.3% |
We pair this table with the stone pull-test gate so a stone that passes the loupe still gets a 1.5 kg pull before it is allowed on the table. Every rejected piece goes into the root-cause bin, and the weekly review decides whether the bench process or the inspection step is the problem.
What we ship to the buyer
For orders over 100 pieces we include a batch QC sheet: total inspected, rejected by defect type, and the final pass rate. We hold this at 98% pass or better before cartons leave. We also photograph a random 5 pieces per SKU under the same angled light and send them with the shipping notice, so the buyer can see the reflection quality for themselves before opening the parcel.
Frequently Asked Questions
Why not just inspect under a regular desk lamp?
A point source creates hot spots and hides haze. A long, even 5,000 K bar at 45 degrees turns every reflection into a straight line that defects bend. The light matters as much as the inspector.
How long does the visual inspection take per piece?
About 30 seconds per ring: 10 seconds rotating, 10 seconds loupe, 10 seconds swab. A 200-piece batch takes one QC person a full day.
Can I send my own QC inspector to your shop?
Yes. We welcome buyer-side QC on runs over 500 pieces, and we will run their checklist alongside ours. Most buyers start with the photo audit and upgrade to a visit after two clean batches.
What if a defect slips through to my customer?
Our warranty covers remake or replacement within 30 days for manufacturing defects. We also photograph the rejected piece for your records so you can talk to your customer with evidence.
Does plating get inspected the same way?
Yes, and more strictly. Plating haze shows up instantly under angled light. We inspect plated pieces twice: once after plating and once after final polish, so a scuffed plate does not get packed.
Key takeaways
- Loupe for detail, angled long-bar light for whole-surface reflection.
- Rotate the ring 360; watch the reflection, not the metal.
- Swab the gallery after ultrasonic; compound residue is a packing reject.
Next step: ask for a sample QC sheet from a recent batch so you can see our defect categories and pass rate. Custom manufacturing opens at 20 pieces per SKU, and every shipment over 100 pieces leaves with a batch QC log and random reflection photos.
