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https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Jewelry that contains at least 950 parts per thousand of pure platinum may be marked or described as "Platinum". Jewelry that contains 850, 900 or 950 parts per thousand of pure platinum may be marked "Plat" or "Pt" if a number is used in front of the term to disclose the amount of pure platinum in the mix, such as : "850 Plat" or "850 Pt", or
https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
If an item is marked as platinum without any qualification, it should have at least 95% pure platinum (950 parts per thousand). Most platinum jewelry sold in the U.S. is 85% platinum and 15% other metals, either precious platinum group metals and/or base metals. Labels will look like this: 850Plat. = 85% …
https://www.thenaturalsapphirecompany.com/education/precious-metal-standards-regulations-marks/platinum-standards-regulations/
According to current FTC guidelines, to be called “platinum,” jewelry must contain at least 500 parts per thousand of pure platinum, although most platinum jewelry sold in the U.S. contains at least 90 percent pure platinum. A platinum fineness mark.
https://www.wsj.com/articles/SB114973105810474493
But many makers and sellers of platinum jewelry say pieces should not bear the word platinum if they are less than 85% platinum -- an international standard for purity -- and are mixed with no...
https://www.ganoksin.com/article/platinum-alloy-applications-for-jewelry/
Japan allows 850, 900, 950 and 1000 parts per 1000 with a small negative tolerance of 0.5%. There are several countries in Europe that allow only 950 standard without tolerance, there are countries that allow a small negative tolerance within this 950 standard and …
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