Jewelry, Watches & Precision Luxury Goods worked example

Inspection Magnification Workload at 14% fatigue and re-inspection allowance: a worked example

This worked example runs the inspection magnification workload numbers for a tougher week than the baseline: 14% fatigue and re-inspection allowance instead of the typical 20%. Estimate the total hours required for quality inspection under magnification (loupe or microscope) for jewelry, watch components, or gemstones. Covers visual inspection of stone settings, surface defects, hallmark verification, and watch movement examination. Accounts for inspection speed and fatigue allowances.

The inputs for this scenario

  • Pieces to inspect under magnification: 75 pieces (held at the documented default)
  • Inspection throughput rate: 15 pieces / hr (held at the documented default)
  • Fatigue and re-inspection allowance: 14 % (the input this scenario stresses; the baseline uses 20)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base inspection time = pieces to inspect รท inspection throughput rate.
  • Scheduled inspection time works out to 5.7 hr at these inputs, and this is the headline figure for the scenario.
  • Base inspection time works out to 5 hr at these inputs.
  • Fatigue and re-inspection allowance applied works out to 14 % at these inputs.
  • Inspection throughput rate works out to 15 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where fatigue and re-inspection allowance sits at 20% and the headline result is 6 hr, this scenario comes in 5% below the baseline at 5.7 hr.
  • Use it when planning a QC shift, quoting an inspection-heavy job, or sizing how many inspectors a luxury batch needs before a ship date. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Scheduled inspection time: 5.7 hr (headline result)
  • Base inspection time: 5 hr
  • Fatigue and re-inspection allowance applied: 14 %
  • Inspection throughput rate: 15 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Inspection Magnification Workload calculator, set fatigue and re-inspection allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.