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https://www.starcojewellers.com.au/w-jewelry/what-is-the-purity-mark-for-platinum-jewelery.html
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://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://ezinearticles.com/?Platinum-Jewelry---Understanding-the-Purity-Markings&id=4091809
Jewelry that contains at least 95 percent platinum (or 950 parts per thousand) can be sold simply as platinum, according to the U.S. Federal Trade Commission (FTC). A piece of this jewelry will simply have the marking "platinum".
https://www.starcojewellers.com.au/p-jewelry/platinum-purity-in-jewelry.html
Platinum used in jewelry, like this ring, is generally of higher purity than gold. Some common platinum hallmarks are: 950 Plat or 950 Pt. - The metal is at least 95% pure platinum and 5% alloy metals; 900 – 90% platinum purity and 10% alloy metals; 850 Plat or 850 Pt.
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.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · If your platinum item has a purity of 950 or 999, it may display the traditional orb mark. In our example photograph, you can see the second stamp is the traditional fineness symbol.
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.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.wikihow.com/Identify-Quality-in-Platinum-Rings
Jun 16, 2021 · The letters will designate the ring as platinum, while the numbers indicate how many parts out of 1000 are pure platinum by weight. If letters are given, they will say either PT, PLAT, or PLATINUM, which indicates that the ring is at least 95% platinum. In the U.S., the number given before or after these letters can be 850, 900, or 950.Views: 129K
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