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https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Platinum Marks . Jewelry can contain different percentages of pure platinum. The US Federal Trade Commission, FTC, publishes guidelines for acceptable marking standards for platinum jewelry sold in the US. Platinum content is usually expressed as the amount of pure platinum the jewelry contains in parts per thousand. Think about it like this ...Estimated Reading Time: 3 mins
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
English and French jewelry makers have used hallmarks since the 14th century, but American makers have never used them on platinum per se. French jewelry makers utilized the eagle head and dog head hallmarks for platinum after 1910, when they formally recognized it as a precious metal.
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.sellyourgold.com/faq/my-items-gold-silver-or-platinum
Hallmarks are distinguishing characteristics that are stamped on gold, silver and platinum items - typically to identify the items purity. There are also hallmarks that can identify where the item was made (called a makers mark), the office the metal was tested in, the year, and the designer.
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.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · Optional platinum hallmarks. The following 3 marks are all optional. Under hallmarking legislation, there is no compulsorary requirement to show these additional marks, however they are often shown. Traditional Fineness Symbol. If your platinum item has a purity of 950 or 999, it may display the traditional orb mark.
https://www.leaf.tv/articles/how-to-test-jewelry-gold-platinum-palladium/
Examine your jewelry for any marks before testing. Use a regular magnifying glass or a professional eye magnifying tool to look your piece over. 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.
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
These three marks are the most prolific on French jewelry. The crab was used for articles made in the departments while the boar’s head was the mark of the Paris assay office. From 1912 a dog’s head is used as the mark for platinum.
https://goodjewelleryguide.com/jewelry-hallmarks-guide/
The first requirement for all jewelry to be found on the market is to have these marks. There are some generally accepted rules and signs around the world. If you have gold jewelry, you should see markings like 18k, 14k, 10k, 750, 585, or 375. If you have silver jewelry, you should see markings like 925 or 800.
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