Bill of Materials
A bill of materials, or BOM, is a structured list of every component and material in a piece, with quantities and specifications.
A bill of materials, or BOM, is the recipe for a piece of jewellery. It lists every metal, stone and finding that goes into it, with quantities and specifications, so the workshop knows exactly what to gather and the business knows exactly what it costs to make.
What a jewellery BOM captures
A ring's BOM might list the gold by weight and purity, the centre stone by shape, size and grade, a count of matched melee for the pave, and the findings involved. Each line carries the detail needed to source, cost and build that part.
Because jewellery mixes priced-by-weight metal with individually graded stones and standard components, the BOM has to handle different kinds of items rather than a single flat parts list.
Why the BOM ties everything together
The BOM is the link between design, costing, production and inventory. It underpins an accurate price for made to order work, because the metal value, stone value and making can all be built up from the listed parts.
It also gives traceability. Change a component, say a larger centre stone or a different alloy, and that change flows through the BOM to the weight, the stone cost and the final price, so nothing is quietly missed.
- A BOM lists every metal, stone and finding in a piece
- Each line carries quantity and specification detail
- It handles weight-based metal and individually graded stones
- It drives accurate costing, production and inventory
- Component changes trace through to weight and final price
Bill of Materials, in short.
Why does jewellery need a BOM if pieces are one-offs?
Even a single custom piece needs its materials gathered, costed and priced accurately. A BOM records exactly what goes in, so the quote is right and the workshop has a clear build list.
What is the difference between a BOM and a SKU?
A SKU identifies a sellable product or variant, while a BOM lists the materials that make it. One tells you what to sell and track; the other tells you what it is built from.
Does a BOM include labour?
A BOM focuses on materials and components, but it feeds costing where making charges and labour are added. Together they build the full cost of the piece.
Related terms
See bill of materials inside a real jewellery system.
JewelleryOS keeps product, pricing, stones and orders in one connected place, built for how jewellery businesses actually work.