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https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
5 rows · These platinum/base metal alloys contain from 50 to 85% pure platinum, but the total of pure ...
https://www.brilliance.com/education/metals/platinum
Jun 11, 2015 · At Brilliance, we're proud to offer a wide assortment of platinum settings for our finest jewelry pieces. All of our platinum consists of at least 95% pure platinum, with a maximum of 5% alloy metals. Nearly all of our solitaire and engagement rings have platinum prongs to keep diamonds securely in place. Platinum Purity
https://www.jewelryshoppingguide.com/what-is-platinum/
Most platinum jewelry generally contains high purity levels, with 85% to 95% platinum commonly used. To put this in perspective, 18-karat gold contains only 75% gold while 14-Karat gold only has 58% gold. In comparison, platinum below 80% purity is not considered platinum.
https://www.bluenile.com/education/metal/platinum
Platinum jewelry is very rare; in fact, 30 times more so than gold. Our platinum is 95% pure (5% iridium, palladium, ruthenium, and other alloys), and its purity makes it naturally hypoallergenic, ideal for those with sensitive skin issues. How to Maintain Platinum's Metal Luster
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.ganoksin.com/article/platinum-alloy-applications-for-jewelry/
Platinum / Palladium Systems While there is palladium jewelry and findings being made, the main use for palladium in the jewelry industry is as an alloy with platinum. Adding palladium to platinum will add some hardness. Palladium oxidizes in the air and the oxides will take on multiple coloring at about 600°C.
https://www.gemsociety.org/article/jewelry-metals-overview/
Rhodium frequently sees use as a non-tarnishing plating for white gold, silver, and other platinum group jewelry metals. Palladium and iridium are commonly alloyed with other metals or used alone to make jewelry pieces. The most common platinum alloys include 90% platinum and 10% iridium, or 95% platinum and 5% ruthenium.
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