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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 use with a minimum of other ingredients, platinum’s luster, strength and durability are legendary. But its purity—used in the finest jewelry at a ratio of 950 parts per thousand—makes platinum the finest …
http://www.mwmjewelry.com/platinum_purity.htm
1) 95% platinum (950) - alloyed with 5% iridium - Vickers hardness = 80 Iridium has an atomic weight of 192.217 - pretty close to that of platinum. We'll need just over 5% of the VOLUME of our platinum - in iridium - to make our "950" blend.
https://www.consumer.ftc.gov/articles/platinum-gold-and-silver-jewelry
Platinum Jewelry Platinum jewelry is rarely made with 100% pure platinum. Instead, platinum is mixed with similar metals or non-precious base metals. Generally, jewelry with a higher percentage of pure platinum is worth more.
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.brilliance.com/education/metals/platinum
If you're examining a piece of jewelry forged from a precious metal, look for the hallmark as a way of indicating its purity. Pure platinum is often marked simply with the letters 'PLT', 'PLAT', or 'PLATINUM', which indicates that the piece consists of at least 95% platinum.Estimated Reading Time: 4 mins
https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · 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 "950 Plat" or "950 Pt"Estimated Reading Time: 3 mins
https://scottgramantiques.com/how-to-test-gold-platinum-and-silver-purity/
May 14, 2020 · #3- Antique jewelry testing- Platinum and White Gold. If that beautiful piece of antique jewelry that you want to sell or may buy is white it might be platinum or it might white gold that is 18 karats or less (22 karat gold is never white). To test for platinum or white gold use the following steps: Step one: Take out your kit and layout the stone.Estimated Reading Time: 5 mins
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