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https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Jewelry that contains at least 950 parts per thousand of pure platinum may be marked or described as "Platinum". 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 :Estimated Reading Time: 3 mins
https://www.tentwothree.com/platinum_jewelry_information.asp
Many estate jewelry hallmarks will be PT900, indicating that the metal is 900 parts per 1000 of pure platinum. The remaining 100 part are usually made with iridium which makes the jewelry harder. 900 Plat - 100Irid - means platinum alloyed with 10% iridium. Pt also the chemical symbol - mark for platinum.
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Platinum rings and ornaments date more than 2,000 years, and the culture of platinum ring-making over the centuries has led to various traditions in jewelry marking. Platinum Content Marks In most countries where platinum jewelry is manufactured, the pure platinum content is at least 85 percent, according to Platinum Today.
https://www.consumer.ftc.gov/articles/platinum-gold-and-silver-jewelry
The metals used in platinum jewelry usually fall into one of three categories: other platinum group metals (palladium, ruthenium, rhodium, iridium, osmium) Marketers describe or mark platinum to show the percentage of pure platinum in the piece. To be called platinum, an item should be at least 50% pure platinum.
https://www.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · A platinum hallmark will consist of 3 compulsory and 3 optional stamps. This post is a simple platinum hallmark guide, which we hope you find useful. If you have platinum to sell, please see our up-to-date scrap platinum prices. We also publish our scrap gold prices and our scrap silver prices. The three compulsory platinum marks Sponsor Mark
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
A Makers Mark is the designer, manufacturing firm or representative symbol that is stamped into your precious metal - also called trademarks. This mark provides proof that your jewelry item was made by the designer or jewelry maker and is considered "signed". All marks …
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. Maker’s Marks.
https://www.specialtymetals.com/blog/2019/9/13/what-is-925-platinum
Sep 13, 2019 · You will also find pieces of jewelry that are marked “925 Silver” and “925 Gold.” Those terms mean exactly what the “925 Platinum” term means – that the item you are looking at contains 92.5% silver or gold. At other times, a ring or other piece of jewelry will only be stamped “925,” which is not very helpful, is it?
https://www.leaf.tv/articles/how-to-test-jewelry-gold-platinum-palladium/
Ten-karat gold is marked 10k, 16, 417, or 10KP; 14-karat gold is marked 583, 585, or 14KP; 18-karat gold is marked 750 or 18KP; 22-karat gold is marked 916 or 917; and pure gold, 24 karat, is marked 999. Marked platinum will say 900 Plat, Plat 900, Pt900, or 900Pt. Modern palladium is usually marked …
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