hallmark
noun
[ ˈhɔːlmɑːk ]
• a mark stamped on articles of gold, silver, or platinum by the British assay offices, certifying their standard of purity.
Similar:
assay mark,
official mark,
authentication mark,
stamp of authenticity,
stamp of authentication,
hallmark
verb
• stamp with a hallmark.
• "he was reprimanded for not hallmarking his work"
Origin:
early 18th century (as a noun): from Goldsmiths' Hall in London, where articles were tested and stamped with such a mark.
