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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 platinum group metals, with at least 500 parts per thousand of the total pure platinum, may be marked as platinum as long as the numbers of each metal are disclosed.Estimated Reading Time: 3 mins
https://www.consumer.ftc.gov/articles/platinum-gold-and-silver-jewelry
85% platinum and 15% other metals (either precious platinum group metals and/or base metals) 800 Pt. 200 Pall. 80% pure platinum, 20% palladium. 750 Pt. 250 Rhod. 75% pure platinum, 25% rhodium. 600 Pt. 350 Irid. 60% pure platinum, 35% iridium. 75% Platinum 25% Copper. 75% pure platinum, 25% copper. 60% Platinum, 35% Cobalt, 5% Rhodium
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.ross-simons.com/education/metals/platinum-jewelry.html
Every piece of platinum jewelry at Ross-Simons is stamped with a quality mark, indicating the percentage of platinum used in the alloy. For example, Pt1000 is pure platinum, while 850Pt or 850Plat is 85% platinum and 15% other metals. Any jewelry with at least 95% platinum may simply be marked "Platinum" or "Plat" .
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