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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 …
https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
To be called platinum, an item should be at least 50% pure platinum (or 500 "parts per thousand"). If an item is marked as platinum without any qualification, it should have at …
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
In most countries where platinum jewelry is manufactured, the pure platinum content is at least 85 percent, according to Platinum Today. Makers commonly alloy platinum with the PGM metals—palladium, ruthenium and iridium. Copper and cobalt are also commonly alloyed with platinum for polishing ability and color.
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · When considering platinum jewelry, the purity mark “950” denotes a composition of 95 percent platinum with a mix of other metal alloys, while “900” is made up of 90 percent platinum, and “850” has 85 percent platinum.
https://www.leaf.tv/articles/how-to-identify-jewelry-markings/
Note that a “950 Platinum” mark indicates that jewelry is 95 percent pure platinum, or 950 parts pure platinum out of 1,000. Identify this type of jewelry by any of these other marks: “Plat 950,” “Pt950,” “PLAT,” “PT,” “950 Plat” or “950Pt.”
https://www.langantiques.com/university/jewelry-makers-mark/
Boucheron Maker’s Mark Maker’s marks are the initials or name of the manufacturing firm or other representative symbol stamped into a gold, silver or platinum item. Also called ‘Trademarks,’ they often provide the only evidence that a certain piece of jewelry has indeed been manufactured by a certain jewelry maker.
https://truval.com/blog/jewelry-identification-marks/
Distinguished jewelry requires the proper distinguishing marks. It’s this process of authentication that endorses quality jewelry for what it is: a highly refined work of art. Ornamentation is nothing if not a reflection of one’s personal style, a marking of both taste and creativity. Throughout history, jewelry has been an early identifier of a person’s […]
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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