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https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
Platinum jewelry with 15% to 50% base metals also may be labeled "platinum.” These platinum/base metal alloys contain from 50 to 85% pure platinum, but the total of pure platinum and other platinum group metals is less than 95%.
https://www.jewelryshoppingguide.com/what-is-platinum/
Platinum used in jewelry has higher purity levels than gold or silver. As we’ve already observed, platinum jewelry will hold at least 80% pure platinum whereas pure gold in jewelry is almost always under 75%. Crafting jewelry from platinum requires specialized tools, higher temperature levels and greater expertise.
https://www.brilliance.com/education/metals/platinum
Jun 11, 2015 · Hallmarks of 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.
https://www.gemsociety.org/article/jewelry-metals-overview/
Platinum Jewelry Use. Although platinum use in various objects goes back as far as 700 BCE, its use in jewelry is relatively modern. Since it has an extremely high melting point and resists corrosion so effectively, refining the metal proved difficult for centuries. The oldest recorded use of platinum is as an inlay in Ancient Egypt.
https://platinumjewelry.com/why-platinum/pure/
Look inside a piece of platinum jewelry and you’ll see its purity stamp. The Federal Trade Commission demands specific marks for the content of any precious metal alloy. To protect American consumers, a high-content platinum alloy will be marked 950Pt, 950, plat or platinum, meaning that it’s at least 95% pure, elemental platinum.
https://www.ganoksin.com/article/platinum-alloy-applications-for-jewelry/
Platinum / Iridium Systems Iridium is one of the PGM’s. It. has a face centered cubic structure and when added to platinum in small quantities it will effect its hardness. The ideal composition for a Pt/lr system has been the 900/100 alloy. It was called Irido-platinum in the 20s and is …
https://www.thoughtco.com/metal-profile-platinum-2340149
Aug 21, 2020 · The largest use, accounting for about 40% of demand, is the jewelry industry where it is primarily used in the alloy that makes white gold. It is estimated that over 40% of wedding rings sold in the US contain some platinum. The USA, China, Japan, and India are the largest markets for platinum jewelry.
https://www.wikihow.com/Identify-Quality-in-Platinum-Rings
Oct 04, 2020 · A composition of 950 parts platinum and 50 parts cobalt is often considered the finest alloy quality for platinum rings. This combination creates an extremely strong and durable ring with a very bright finish, looking almost as if it has been lit from the inside.Views: 120K
https://www.minerals.net/mineral/platinum.aspx
Platinum jewelry is rare, beautiful, and durable, and is therefore highly regarded. Native Platinum is the most significant source of the element platinum, although considerable quantities are also mined from the rare platinum arsenide mineral Sperrylite.
https://www.pricescope.com/articles/overview_common_alloys_used_jewelry
Dec 21, 2006 · Harder than other traditional platinum alloys, it was developed by the late Steven Kretchmer, who introduced tension-set rings in the USA, under the name SK Platinum. 950 PlatOro is 95% platinum and 5% gold by weight. Also from Hoover & Strong, it has high flow characteristics which keep porosity to a minimum.
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