Most labs ask for several finished pieces of each style, and sometimes extra loose components, rather than a single sample. The exact number depends on the tests, the size of the piece and how many different materials it contains, so ask the lab for its sample requirement before you send anything.
Sending too few samples is one of the most common reasons a jewellery test is delayed.
Why one piece is rarely enough
- Some tests destroy the sample. Lead and cadmium content tests dissolve the material, so the piece cannot be reused.
- Nickel release testing needs pieces that are intact and have not been handled heavily.
- Each material may be tested separately, and small pieces may not have enough of each material.
- Labs often keep a retained sample in case of questions later.
- If a result is borderline, the lab may need to repeat the test.
Plan for small and mixed pieces
Earrings, small charms and studs contain very little material per piece, so labs may need more of them. Mixed pieces, such as a necklace with a plated chain, enamel pendant and stones, may need extra loose parts so each material can be tested on its own. Ask the maker to supply spare components from the same production batch, labelled clearly.
Keep the samples honest
The samples should come from the same materials and process as your bulk order. Draw them yourself from production where you can, seal them and record the lot number. Keep an identical set as a counter-sample, so you can compare production against what passed. Our guide on making your bulk order match the approved sample covers how to do this.
What this means for a buyer
Ask the lab for its sample list first, then add a margin and a counter-sample set. Extra pieces cost little compared with a week lost waiting for more. Creston & Co works for buyers only, for a fixed fee agreed in writing. We draw and seal test samples in Rajkot, keep counter-samples and send them to accredited labs. Start with a free sourcing review.