How should a QC inspector use a 10x loupe on finished jewelry?

ZKZ Editorial TeamMain answer · Product & gemmology desk

Use good, even light, hold the loupe close to your eye and bring the piece to the loupe, steadying your hands against your face or the table. Inspect in the same order every time and note what you find.

Setting up

Our advice A 10x loupe is a standard tool for jewelry inspection. It shows surface detail that is invisible to the naked eye.

1. Clean the piece and your hands.
2. Use a bright, diffuse light, such as a daylight lamp.
3. Place a neutral background, such as a white or grey mat.

Technique

1. Hold the loupe close to your eye.
2. Bring the piece close to the loupe until it is in focus.
3. Rest your hands together or on the table to keep still.
4. Move the piece slowly, scanning each area.

What to look for

• Scratches, pitting and polishing marks
• Rough edges and solder joints
• Stone chips, scratches or loose settings
• Uneven plating, thin spots or discolouration
• Missing or unclear marks

It depends How much a loupe shows depends on light and technique. A small pit may be acceptable on a hidden surface and not on a visible face.

Record

Our advice Photograph defects through the loupe if possible, and write the location and type in the log.

Tips

• Take breaks to avoid eye strain
• Compare with the golden sample
• Use the same inspection order each time

Fact GIA says that clarity, polish and symmetry grading of a diamond can only be finalised using a 10x loupe, and that many blemishes and inclusions are not visible to the naked eye.

Train the inspector

Our advice Give new inspectors a set of reference pieces showing acceptable and unacceptable finish, and let them practise on these. Review their first reports with them. Consistent standards matter more than speed, and an inspector who knows what you accept will make decisions faster and with more confidence.

Uncertain We cannot say what level of defect is acceptable for your product. Agree it in your specification.

Related reading: What should I do if my jewelry arrives damaged or not as described? · How to Request a Jewelry Prototype

Sources

• GIA 4Cs, Diamond clarity

Fact = stated by the cited source. Our advice = editorial recommendation. Uncertain / it depends = limits of what can be said in general.