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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.
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Platinum Content Marks 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.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · If your platinum item has a purity of 950 or 999, it may display the traditional orb mark. In our example photograph, you can see the second stamp is the traditional fineness symbol.
https://ezinearticles.com/?Platinum-Jewelry---Understanding-the-Purity-Markings&id=4091809
Platinum jewelry basically falls into three categories of purity, each with its own type of marking: Platinum, Plat/Pt, and platinum group metal mixtures. Platinum Jewelry that contains at least 95 percent platinum (or 950 parts per thousand) can be sold simply as platinum, according to the U.S. Federal Trade Commission (FTC).
http://www.mwmjewelry.com/platinum_purity.htm
Platinum Purity . I use "Classic" 90% platinum / 10% iridium in my work (PT 900) ... were the same as 90/10 IR (900) platinum. Respectfully, Mark Morrell. Thanks to my friend - Bob Lynn - for his input on some of the technical issued addressed above - and for encouraging me to stop working long enough to write this document. References:
https://scottgramantiques.com/how-to-test-gold-platinum-and-silver-purity/
May 14, 2020 · If the jewelry is platinum then the mark should keep its bright, white color. If the jewelry is 18 karat white gold, then the mark should start to change to a light bronze color in about 3 minutes. If the jewelry is 14 karat white gold then the mark should disappear in about 15 seconds. #4- …Location: 14630 N Hana Maui Dr, Phoenix, 85022, Arizona
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · When considering platinum jewelry, the purity mark “950” denotes a composition of 95 percent platinum with a mix of other metal alloys, while “900” is made up of 90 percent platinum, and “850” has 85 percent platinum.
https://www.jewelryshoppingguide.com/what-is-platinum/
A hallmark is a small identification symbol that is stamped on the jewelry, indicating the level of purity of the metal. Platinum used in jewelry, like this ring, is generally of higher purity than gold. Some common platinum hallmarks are: 950 Plat or 950 Pt.
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