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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.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Platinum Content Marks 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.tentwothree.com/platinum_jewelry_information.asp
Pt also the chemical symbol - mark for platinum. PLATINUM - indicating mainly platinum. Platine - French or Canadian mark . Dog's Head - French mark indicating platinum used after 1912. PT950 - platinum. Indicating that 950 parts per 1000 containing platinum. After 1973, The Hallmarking Act was initiated, which will now not allow jewelry to be ...
https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
Marketers describe or mark platinum in terms of the percentage of pure platinum in the piece. 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 least 95% pure platinum …
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.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 …
https://www.gold-traders.co.uk/blog/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
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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