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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 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", orEstimated Reading Time: 3 mins
https://www.silverrecyclers.com/blog/950-platinum.aspx
The number 950 refers to its level of purity, and it means that your item is 95% platinum and 5% alloy. This number system is an easy way to tell an item's purity. Another example is 900 platinum which is equal to 90% platinum. The alloy used with platinum is typically either copper, rhodium, titanium, palladium, cobalt, or iridium.
https://www.leaf.tv/articles/what-is-the-meaning-of-numbers-on-jewelry/
Platinum is more rare and more expensive than gold. "Plat" or "950 Plat" is nearly pure platinum. "IridPlat" is 90 percent platinum mixed with 10 percent other metals.
https://www.bluenile.com/education/metal/platinum
Purity of 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…
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