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https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
If an item is marked as platinum without any qualification, it should have at least 95% pure platinum (950 parts per thousand). Most platinum jewelry sold in the U.S. is 85% platinum and 15% other metals, either precious platinum group metals and/or base metals. Labels will look like this:
https://eragem.com/news/the-history-of-platinum-jewelry/
Dec 02, 2013 · Slowly, over the following three decades, platinum jewelry began tits resurgence throughout Europe, first in Germany, then Switzerland and Italy, then the UK. Finally, in the 1990s, it gained in popularity in the US and China. Today, platinum jewelry holds its own alongside gold, particularly for wedding and engagement jewelry.
https://www.ftc.gov/news-events/media-resources/tools-consumers/jewelry-guides
In 2010, the FTC revised its Jewelry Guides in response to changes in the way the industry manufactures platinum. In recent years, some manufacturers have added base metals such as copper and cobalt to platinum jewelry sold to consumers. The revisions spell out how these new platinum/metal alloy products should be described and advertised.
https://www.jewelryshoppingguide.com/what-is-platinum/
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. – Platinum purity is 85% with the other 15% being other metals
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