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Jewelry Hallmarks & Stamps: Decoding Metal Purity, Origin, and Maker

Stamps on jewelry convey metal content, origin, maker, and quality assurance.

Metal Purity Marks

MarkMeaning
10K, 14K, 18K, 22K, 24KGold karat (parts per 24); 14K = 58.3% Au
417, 585, 750, 916, 999Millesimal fineness (parts per 1000); 750 = 18K
925, .925, STERLING, STERSterling silver = 92.5% Ag
950, PT950, PLAT, PLATINUMPlatinum 95% pure
STAINLESS, SS, 316LStainless steel (surgical grade 316L)

Other Common Marks

  • Maker’s mark / Hallmark – Registered symbol/initials of manufacturer (e.g., “T&Co” for Tiffany).
  • Assay office mark – Government-certified purity (UK: Leopard, Anchor, Castle, Rose).
  • Country of origin – “ITALY,” “USA,” “CHINA,” etc.
  • GF / GP / HGE – Gold-filled (1/20th total weight), gold-plated (thin layer), heavy gold electroplate.
  • 925 on gold-colored item – Vermeil (sterling silver base, thick gold plate).

Decoding Tips

  • Use loupe (10×); marks often tiny, worn.
  • Reference hallmark databases (e.g., Birmingham, London, US maker registries).
  • Absence of mark ≠ fake (pre-1900, handmade, wear).

Professional appraisal confirms authenticity and value.

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