Pewter is a tin-based alloy traditionally composed of tin with small additions of copper, antimony, and historically lead, distinguished by its low melting point of approximately 230 degrees Celsius, its soft malleability, and its dull grey lustre. Used for centuries in domestic hollowware, ecclesiastical fittings, and ornament, pewter occupies a position in the hierarchy of jewellery metals well below silver and the precious metals, but remains a working material in costume jewellery, historical reproduction, and small-scale studio casting. Modern pewter is reformulated to be lead-free, with antimony and copper replacing the lead content of older alloys.

Composition and grades

Pewter contains 85 to 99 per cent tin, with the balance made up of copper (typically 0.5 to 4 per cent) for hardness and casting characteristics, antimony (1 to 8 per cent) for further hardness and to suppress the allotropic tin-pest transformation at low temperatures, and historically lead (up to 30 per cent in older pewter) which is now banned for any application involving food contact or body wear. Britannia metal is the highest commercial grade, comprising approximately 92 per cent tin, 6 per cent antimony, and 2 per cent copper; it gives a brighter finish and harder surface than ordinary pewter.

The relevant standards are EN 611-1 (European pewter standard) for chemical composition and ASTM B560 (American standard for pewter) for analogous specifications. The American Pewter Guild and the Worshipful Company of Pewterers in London maintain reference standards and craft documentation.

Working characteristics

Pewter casts at temperatures accessible to small-scale equipment — most pewter melts in a steel or cast-iron crucible over a propane burner — and tolerates a wider range of mould materials than higher-melting alloys. Steel, brass, plaster, vulcanised rubber, and silicone moulds all work; cuttlebone and sand casting are traditional methods. Pewter takes fine detail well and reproduces surface texture from rubber and silicone moulds with high fidelity, making it a routine choice for small-batch reproduction work.

The alloy is soft (Mohs hardness around 1.5, Brinell hardness around 25 to 35 depending on grade), and the resulting castings deform easily under impact. It is therefore unsuitable for prong settings or any application where structural integrity is required; pewter jewellery is worn for ornament rather than for daily use as fine jewellery. The metal can be polished to a satin or bright finish but tarnishes more rapidly than silver, developing a darker grey patina over time.

In the trade

Pewter jewellery occupies the costume and craft segments of the market. The material is used for medallions, belt buckles, pendants, and historical reproduction work — Celtic-style pieces, Renaissance reproductions, and similar — where the soft grey colour and casting fidelity suit the aesthetic. Pewter is also used by studio casters for prototyping and pattern work; final pieces are then re-cast in silver or gold from the pewter master.

Hallmarking conventions vary by jurisdiction. The UK Pewterers' touchmark system identifies maker and quality but is not a precious-metal hallmark in the same regulatory sense as silver and gold. Pewter pieces should not be marketed as silver and the consumer-protection legislation in most markets requires clear disclosure.

Care

Modern lead-free pewter is safe to wear and tolerates routine cleaning with mild soap and warm water. Avoid abrasive polishes, which scratch the soft surface; mild silver polish suitable for soft metals can be used sparingly. Ultrasonic and steam cleaning are not recommended.

Further reading

• Victoria and Albert Museum — pewter reference
• Worshipful Company of Pewterers
• International Gem Society — metals reference