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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: 850Plat. = …
https://www.jewelryshoppingguide.com/what-is-platinum/
You will rarely find 100% pure platinum jewelry. Platinum is almost always mixed with other metals, but needless to say the higher the percentage of pure platinum the more expensive the metal. Copper, ruthenium, iridium, rhodium, palladium and cobalt are the most popular base metals used in …
https://www.wisegeek.com/what-is-platinum-jewelry.htm
May 06, 2020 · Platinum jewelry is made from very pure platinum. As compared to gold, platinum falls between the 18-karat and 24-karat range, with 18 karat being approximately 75% pure and 24 karat being the purest. Since 18-karat jewelry is 75% pure, that means that the other 25% of the piece is an alloy, such as silver, zinc or copper.
https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Platinum is a rare precious metal primarily used to create fine jewelry. Its heavy weight and durability make platinum a metal that will not wear away with constant use like gold. Platinum holds fine gemstones firmly in place for the life of the jewelry when used for …
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