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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
Platinum jewelry should be labeled so you can tell how much platinum there is in the piece. Any jewelry that is not labeled platinum, plat., or pt. contains less than 50% pure platinum and shouldn’t be marketed as platinum.
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Platinum rings and ornaments date more than 2,000 years, and the culture of platinum ring-making over the centuries has led to various traditions in jewelry marking. Platinum Content Marks In most countries where platinum jewelry is manufactured, the pure platinum content is at least 85 percent, according to Platinum Today.
https://platinumjewelry.com/why-platinum/pure/
Look inside a piece of platinum jewelry and you’ll see its purity stamp. The Federal Trade Commission demands specific marks for the content of any precious metal alloy. To protect American consumers, a high-content platinum alloy will be marked 950Pt, 950, plat or platinum, meaning that it’s at least 95% pure, elemental platinum.
https://www.brilliance.com/education/metals/platinum
Hallmarks of Platinum If you're examining a piece of jewelry forged from a precious metal, look for the hallmark as a way of indicating its purity. Pure platinum is often marked simply with the letters 'PLT', 'PLAT', or 'PLATINUM', which indicates that the piece consists of at least 95% platinum.
https://www.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Simple Platinum Hallmark Guide Platinum hallmarking was introduced in the UK in 1975 as a result of legislation brought about by the Hallmarking Act of 1973. Prior to this date, items containing platinum would often carry no markings or simply ‘Plat’ or ‘Platinum’ and would be of varying purity. A typical platinum hallmark
https://mjsa.org/publicationsmedia/compliance_guides/stamping_and_marking
• If a jewelry maker wants to stamp jewelry by its quality or "fineness" (e.g., "14 gold," "925 sterling silver," or "950 platinum"), then, in addition to the fineness stamp, the maker must stamp the metal with its federally registered trademark.
https://thinkengraved.com/blogs/news/a-guide-to-what-jewelry-stamps-mean
Jul 19, 2018 · Each number stands for the percentage of purity of gold, platinum, and silver. For gold, the stamps are 375, 585, 750, 916, 990 and 999 For silver, the stamps are 800,925,958 and 999 For platinum, the stamps are 850, 900, 950 and 999
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