How to say "hallmark" in Japanese

• 極印ごくいん
  nounThe literal sense of 'hallmark': a stamp or punch mark physically impressed on an object, typically precious metal, to certify it. Outside this concrete marking sense it is seldom the word you want.
• 品位証明ひんいしょうめい
  nounThe hallmark understood as the quality certification of a precious metal — the certification itself rather than the stamped mark. A less common term, tied to precious-metal assaying.
• 折り紙おりがみCommon
  nounThe common, everyday choice: a certificate of authenticity accompanying a work of art or craft, and figuratively a mark of guaranteed quality or approved skill.

For the literal stamp and the quality certification of precious metal, 極印 and 品位証明 are the less common, trade-specific words; 「折り紙」 is the common word for certificates of authenticity and figurative marks of quality.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 極印ごくいんhallmark
• 品位証明ひんいしょうめいquality certification (of a precious metal)
• 折り紙おりがみhallmark