Metal value only, not an appraisal or an offer. Real items can differ from their stamp within legal tolerances, and jewelry may include stones, solder or other metals: weigh the precious metal only.
Sources and conventions
- Karat (K) means parts of gold per 24. We show n/24 × 1000 rounded to one decimal: 10K = 416.7 ‰ (often stamped 417), 16K = 666.7 ‰, 22K = 916.7 ‰ (the UK hallmark standard is 916.6). US rules call fine gold “24 karat”, but bullion is sold as 999 or 999.9, so those are separate rows.
- 14K: the European/UK hallmark is 585 ‰, slightly above 14/24 = 583.3 ‰. Both rows are shown and labelled.
- Hallmark standards (UK Hallmarking Act 1973, Schedule 2): gold 375, 585, 750, 916.6, 990, 999; silver 800, 925, 958.4, 999; platinum 850, 900, 950, 999. US jewelry rules (16 CFR Part 23) require 925 for “sterling” and list 850, 900 and 950 platinum marks.
- Other rows come from official coin laws: 900 ‰ (US Coinage Acts of 1837 and 1873), 400 ‰ overall (US Coinage Act of 1965), 835 ‰ (Spanish decree of 1868), 999.9 ‰ gold and 999.5 ‰ platinum (Australian Currency Determination 2019).
- Not shown: 600 silver, because we found no standard convention for it.
- 16 CFR Part 23 (FTC Guides for the Jewelry, Precious Metals, and Pewter Industries), eCFR. «not composed throughout of fine (24 karat) gold» · «at least 925/1,000ths pure silver» · «“950Pt.,” “950Plat.,” “900Pt.,” “900Plat.,” “850Pt.,” or “850Plat.”» US Government work, public domain in the US (17 U.S.C. §105)
- Hallmarking Act 1973, Schedule 2, Part I, para. 2 (legislation.gov.uk). «Gold 375 · Gold 585 · Gold 750 · Gold 916.6 · Gold 990 · Gold 999 · Silver 800 · Silver 925 · Silver 958.4 · Silver 999 · Platinum 850 · Platinum 900 · Platinum 950 · Platinum 999» Contains public sector information licensed under the Open Government Licence v3.0
- Coinage Act of 1873, 17 Stat. 424, sec. 13 (govinfo.gov). «of one thousand parts by weight nine hundred shall be of pure metal» US Government work, public domain in the US (17 U.S.C. §105)
- Coinage Act of 1965, Pub. L. 89-81, 79 Stat. 254, sec. 101 (govinfo.gov). «whole coin weighs 11.5 grams and contains 4,6 grams of silver» · «Any coins minted after the enactment of the Coinage Act of 1965 from 900 fine coin silver shall be inscribed with the year 1964» US Government work, public domain in the US (17 U.S.C. §105)
- Decreto de 19 de octubre de 1868, Gaceta de Madrid núm. 294, art. 4.º (boe.es). «2 pesetas» · exact weight 10 grams · exact fineness 835 thousandths (our translation of the Spanish table; the original is in the linked Gazette) Reuse under BOE conditions; source: Agencia Estatal Boletín Oficial del Estado
- Currency (Australian Coins) Determination 2019, Part 2 (The Perth Mint), legislation.gov.au. «At least 99.99% gold» · «At least 99.95% platinum» Licensed under CC BY 4.0 (Commonwealth of Australia)