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Pewter is a metal alloy, traditionally between 85 and 99 percent tin, with the remainder consisting of 1-4 percent copper, acting as a hardener, with the addition of lead for the lower grades of pewter. There were three grades: Fine, for eatingware, with 96-99 percent tin, and 1-4 percent copper; Trifle, also for eating and drinking utensils but duller in appearance, with 92 percent tin, 1-4 percent copper, and up to 4 percent lead; and Lay or Ley metal, not for eating or drinking utensils, which could contain up to 15 percent lead. Modern pewter mixes the tin with copper, antimony and/or bismuth, as opposed to lead.

Physically, pewter is a bright, shiny metal that is very similar in appearance to silver. Like silver, pewter will also oxidize to a dull gray over time if left untreated. Pewter is a very malleable alloy, being soft enough to carve with hand tools, and it also takes good impressions from punches or presses. Some types of pewter pieces, such as candlesticks, would be turned on a metal lathe. Pewter has a low melting point, and duplication by casting will give excellent results.

Use of pewter was common from the Middle Ages up until the various developments in glass-making during the 18th and 19th centuries. Mass production of glass products has seen glass universally replace pewter in day-to-day life. Pewter artifacts continue to be produced, mainly as decorative or specialty items.

Unlidded mugs and lidded tankards are certainly the most commonly-known pewter artifacts from the 19th century, although the metal is also used for porringers, plates, cutlery and jewelry.

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