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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
5 rows · If an item is marked as platinum without any qualification, it should have at least 95% pure ...
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Hallmarks and maker's marks help identify the origin of antique and period platinum rings. Hallmarks, also known as quality or purity marks, guarantee the purity or quality of a precious metal. They are expressed with numbers, symbols, letters or a combination thereof stamped, impressed or struck on platinum to indicate its fineness, according to Modern Silver Magazine.
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