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https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · The easiest way to determine the metal used in your jewelry is by examining the hallmarks or markings. All modern platinum jewelry requires stamps indicating metal content.Estimated Reading Time: 3 mins
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Platinum content markings are based on parts per thousand of pure platinum in the ring. According to the Federal Trade Commission, in the United States, "Platinum" (without additional qualifications) can only be used to mark and describe rings made with at least 950 parts pure platinum throughout.
https://www.starcojewellers.com.au/d-jewelry/does-platinum-jewelry-have-markings.html
Platinum content markings are based on parts per thousand of pure platinum in the ring. According to the Federal Trade Commission, in the United States, "Platinum" (without additional qualifications) can only be used to mark and describe rings made with at least 950 parts pure platinum throughout. Platinum Estate Jewelry Information and Hallmarks
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