The process of stamping precious metals with an official mark to certify their quality and purity.
From hallmark plus present participle -ing; the gerund form referring to the systematic practice established in London's Goldsmiths' Hall in the 14th century.
Hallmarking is one of the oldest quality-control systems still in use—England's hallmarking standards for gold and silver date back to 1327, making it older than most countries!
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