What is the difference between tempering and annealing?

Annealing fully softens metal so it can be shaped more easily, usually by heating to a high temperature and cooling slowly. Tempering is applied after hardening specifically to reduce brittleness while keeping the metal strong, which is a much more precise balance. Annealing removes hardness; tempering fine-tunes it.

Is tempering used in fine jewellery making?

Tempering comes up most in the context of steel tools a jeweller uses, such as gravers, saw blades and burnishers, rather than in the gold and silver of the jewellery itself. Precious metals are typically worked through annealing, not tempering, because they do not respond the same way as steel.

How do you know when metal has been properly tempered?

One traditional indicator is colour. When steel is polished and gently heated, it passes through a sequence of oxide colours from pale yellow through straw, bronze, purple and blue, and the correct temper colour for a given tool type indicates the right temperature has been reached. Modern controlled furnaces make this more precise.

What is tempering in metalwork and jewellery?

By Jared James · Last updated 21 May 2026

Definition

Tempering is a heat treatment applied to metal after it has been hardened, reheating it to a specific temperature below its hardening point and then allowing it to cool in a controlled way. The aim is to reduce the brittleness that hardening introduces without losing the strength that was gained. In jewellery and tool making, tempering is most relevant to steel tools such as gravers and saw blades, where a properly tempered tool holds an edge and resists snapping under use. It is a more controlled and targeted process than annealing.

Frequently asked questions

What is the difference between tempering and annealing?: Annealing fully softens metal so it can be shaped more easily, usually by heating to a high temperature and cooling slowly. Tempering is applied after hardening specifically to reduce brittleness while keeping the metal strong, which is a much more precise balance. Annealing removes hardness; tempering fine-tunes it.
Is tempering used in fine jewellery making?: Tempering comes up most in the context of steel tools a jeweller uses, such as gravers, saw blades and burnishers, rather than in the gold and silver of the jewellery itself. Precious metals are typically worked through annealing, not tempering, because they do not respond the same way as steel.
How do you know when metal has been properly tempered?: One traditional indicator is colour. When steel is polished and gently heated, it passes through a sequence of oxide colours from pale yellow through straw, bronze, purple and blue, and the correct temper colour for a given tool type indicates the right temperature has been reached. Modern controlled furnaces make this more precise.

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