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https://platinumjewelry.com/why-platinum/pure/
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 metal available on the …
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. This is a very soft alloy - is extremely malleable - Setting stones is the least risky in this alloy. Dents and dings occur easily.
https://www.brilliance.com/education/metals/platinum
Jun 11, 2015 · At thirty times more rare than gold and four times stronger, platinum has become synonymous with luxury and longevity. Comprised of 95% pure platinum and four times stronger than gold. Hard wearing and resistant to damage. Silvery white color compliments diamonds.
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.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
In most countries where platinum jewelry is manufactured, the pure platinum content is at least 85 percent, according to Platinum Today. Makers commonly alloy platinum with the PGM metals—palladium, ruthenium and iridium. Copper and cobalt are also commonly alloyed with platinum for polishing ability and color.
https://www.candere.com/collections/platinum.html
Another interesting point is, platinum’s purity exceeds that of the other metals in 18K & 14K; its denser hence is preferred over other metals for setting precious stones. Thanks to the durability of platinum, its finish, luster and shine remains intact over a long period of time and apart from a rare polishing, there is no maintenance required.
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