What is work hardening in jewellery making?
By Jared James · Last updated 21 May 2026
Definition
Work hardening is what happens to metal when it is repeatedly bent, hammered, rolled or drawn: the internal crystal structure of the metal becomes disrupted and compressed, which makes the metal progressively stiffer and more brittle. If you keep working hardened metal without addressing it, the metal will eventually crack. Jewellers recognise when metal is becoming too resistant to shape and reverse the process by annealing, which involves heating the metal to relax its structure and restore its softness.
Frequently asked questions
- Why does metal work harden?
- As you deform metal mechanically, the crystals within it break up and become more tightly packed, which resists further movement. The more you work it in the same direction, the stiffer it becomes until it cracks if pushed further.
- Is work hardening always a problem?
- Not always. Jewellers sometimes deliberately work harden wire and thin sheet to add springiness and resilience to a finished piece, such as in clasps, catches and spring rings where the metal needs to hold its shape under pressure.
- How do you reverse work hardening?
- The solution is annealing: heating the metal with a torch to a specific temperature, then allowing it to cool or quenching it in water. This relaxes the internal structure and returns the metal to a workable, soft state so the jeweller can continue shaping it.
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