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https://www.ganoksin.com/article/platinum-alloy-applications-for-jewelry/
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.
http://www.capepreciousmetals.com/wp-content/uploads/2018/01/guide_to_Pt_alloys.pdf
Platinum/Palladium Systems In the jewelry industry, palladium is alloyed with platinum mainly to add hardness. Palladium oxidizes when exposed to air, and the oxides take on multiple colorings at about 600°C. The colors will disappear as the oxidation is consumed at higher temperatures, and will not reappear in the finished product.
https://www.brilliance.com/education/metals/platinum
The most common alloy metals paired with platinum are copper, palladium, rhodium, iridium, and titanium. Although some alloys may be billed as platinum by jewelry sellers, there are stringent requirements for what constitutes a 'pure' platinum piece. Only metals marked with a 950 or 900 purity designation are considered high-grade platinum.Estimated Reading Time: 4 mins
https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Platinum content is usually expressed as the amount of pure platinum the jewelry contains in parts per thousand. Think about it like this: you mix up a huge bucket of fruit tea that contains 1,000 ounces--900 hundred of the ounces are plain tea and 100 are fruit juice. That makes the tea 900 parts per thousand of your mix.Estimated Reading Time: 3 mins
https://www.specialtymetals.com/blog/2014/7/28/platinum-sterling-what-you-need-to-know-about-this-precious-alloy
Jul 28, 2014 · A little more than a decade ago, American Bullion Inc. (ABI) of Carson, California, created and registered a trademark for a new kind of alloy, Platinum Sterling™. The goal was to create an alloy for jewelry that would be beautiful, resistant to tarnishing – in …
https://platinumjewelry.com/why-platinum/pure/
When compared with the gold alloys commonly used in jewelry, platinum contains a higher concentration of its elemental metal. Pure gold is known as 24K, but is much too soft and malleable to be worn in most jewelry, so it must be alloyed with other metals. White or yellow 14K gold contains only 58.5% of the actual metal and 18K contains 75%.
https://jewelryinformer.com/platinum/platinum-group-metals/
Palladium rings with white stones. Apart from platinum, palladium is the only one of the platinum group metals used in large amounts within jewelry metal alloys. The standard formulation is 95% palladium, with 5% ruthenium to add hardness and durability.. Palladium has a slightly darker hue than platinum, edging closer to silver-gray than silver-white.
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
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