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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
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 …
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
After 1973, The Hallmarking Act was initiated, which will now not allow jewelry to be marked platinum if it falls below 950 parts. Many fine contemporary vintage platinum rings with precious gemstones such as tanzanite, sapphires, topaz and diamonds now available due to …
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 indeed been manufactured by a …
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 […]
https://www.wikihow.com/Identify-Quality-in-Platinum-Rings
Oct 04, 2020 · PLAT can be marked only on jewelry containing a minimum of 95% pure platinum; you'll have to get it tested to determine the exact grade.Views: 120K
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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