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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. = 85% pure platinum
https://www.brilliance.com/education/metals/platinum
Jun 11, 2015 · At thirty times more rare than gold and four times stronger, platinum has become synonymous with luxury and longevity. Comprised of 95% pure platinum and four times stronger than gold. Hard wearing and resistant to damage. Silvery white color compliments diamonds.
https://platinumjewelry.com/why-platinum/pure/
White or yellow 14K gold contains only 58.5% of the actual metal and 18K contains 75%. Naturally durable yet malleable, platinum need only be mixed with the smallest amount of other platinum group metals to create an alloy that can be molded, cast and shaped into the world’s most elegant jewelry. Platinum jewelry is either 90% or 95% pure platinum.
https://www.gemsociety.org/article/jewelry-metals-overview/
In addition to platinum, this group includes iridium, osmium, palladium, rhodium, and ruthenium. While platinum is the most abundant, all these metals, except osmium, have jewelry applications. Rhodium frequently sees use as a non-tarnishing plating for white gold, …
https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Ruthenium. Rhodium. Osmium. As long as 50% of the alloy contains platinum and some other combination of metals above, the piece can be labeled as containing platinum. If for instance, jewelry contains 50% platinum and 50% gold, that piece can not contain a hallmark indicating the piece contains platinum.
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.wikihow.com/Identify-Platinum-and-Silver-Jewelry
Feb 05, 2020 · However, if your platinum jewelry is reacting to a magnet, don't panic. Pure platinum is a soft metal, so alloys are added to strengthen the finish. Cobalt, which is quite hard, is becoming popular as a platinum alloy. Because cobalt is slightly magnetic, some platinum jewelry …Views: 609K
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