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https://platinumjewelry.com/why-platinum/pure/
Purity is the game. When you select platinum jewelry, you’re buying a product that consists of a metal that’s almost entirely pure – 90-95%. Mined from deep within the Earth and transformed for jewelry …
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% …
https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
Marketers describe or mark platinum in terms of the percentage of pure platinum in the piece. To be called platinum, an item should be at least 50% pure platinum (or 500 "parts per thousand"). If an item is marked as platinum without any qualification, it should have at least 95% pure platinum …
http://www.mwmjewelry.com/platinum_purity.htm
Precious metals are generally mixed with other metals to establish their rating, karat, or numerical designation by weight. In "950" platinum, 95% of the weight of the net alloy will be platinum mixed with …
https://www.brilliance.com/education/metals/platinum
Jun 11, 2015 · 950 Platinum Pieces marked with a 950 purity are a blend of 95% platinum and 5% alloy metals (usually ruthenium, copper, cobalt, iridium, rhodium, or palladium). 900 Platinum Pieces …
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