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https://goodjewelleryguide.com/jewelry-hallmarks-guide/
Jan 21, 2021 · The first requirement for all jewelry to be found on the market is to have these marks. There are some generally accepted rules and signs around the world. If you have gold jewelry, you should see markings like 18k, 14k, 10k, 750, 585, or 375. If you have silver jewelry, you should see markings like 925 or 800.
https://www.gemporia.com/en-us/gemology-hub/article/1056/what-is-hallmarking-on-jewelry/
Sep 13, 2018 · 1854 Gold standards of 37.5% (9 karat), 50% (12 karat) and 62.5% (15 karat) are introduced, though 18 karat and 22 karat remain in use. 1932 Gold standard of 58.5% (14 karat) replaces 12k and 15k. 1975 Platinum added to hallmarked metals in purities of 85%, 90%, 95% and 99.9%.4.8/5
https://bis.gov.in/index.php/hallmarking-overview/
Feb 14, 2021 · Hallmarking overview. The BIS Hallmarking Scheme has been aligned with International criteria on hallmarking. As per this scheme, Registration is granted to the jewellers by BIS under Hallmarking Scheme. The BIS certified jewellers can get their jewellery hallmarked from any of the BIS recognized Assaying and Hallmarking Centres.
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
Up to 1854, the legal standards for gold were 18ct and 22ct. In 1854 these standards were broadened with 15ct, 12ct, and 9ct. In 1932 the 12ct and 15ct standards for gold were abolished in favor of the 14ct mark. For Scotland and Ireland, the marks and standards are marginally different.
https://bis.gov.in/wp-content/uploads/2020/01/Mandatory-Hallmarking-Order-15.01.2020.pdf
Bureau of Indian standards, is of the opinion that it is necessary or expedient so to do in the public interest, hereby makes the following Order, namely:- 1. Short title and commencement.—(1) This Order may be called the Hallmarking of Gold Jewellery and Gold Artefacts Order, 2020.
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