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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 platinum group metals, with at least 500 parts per thousand of the total pure platinum, may be marked as platinum as long as the numbers of each metal are disclosed. For instance, "600 Pt. …
https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
If an item is marked as platinum without any qualification, it should have at least 95% pure platinum (950 parts per thousand). Most platinum jewelry sold in the U.S. is 85% platinum and 15% other metals, either precious platinum group metals and/or base metals. Labels will …
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
According to the Federal Trade Commission, in the United States, "Platinum" (without additional qualifications) can only be used to mark and describe rings made with at least 950 parts pure platinum throughout. Such a ring may simply read "Platinum," "Plat" or "Pt," or may be marked "95% Plat," "950 Plat" or "950 Pt."
https://www.tentwothree.com/platinum_jewelry_information.asp
PLATINUM ESTATE JEWELRY HALLMARKS. 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. PT850 - platinum at 85% . Pt also the chemical symbol - mark for platinum. PLATINUM - indicating …
https://www.leaf.tv/articles/how-to-test-jewelry-gold-platinum-palladium/
Marked platinum will say 900 Plat, Plat 900, Pt900, or 900Pt. Modern palladium is usually marked Pd950. If you can't find a mark, you'll have to test the piece.
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. You can find these hallmarks in a variety of places.
https://www.langantiques.com/university/jewelry-makers-mark/
Boucheron Maker’s Mark Maker’s marks are the initials or name of the manufacturing firm or other representative symbol stamped into a gold, silver or platinum item. Also called ‘Trademarks,’ they often provide the only evidence that a certain piece of jewelry has …
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.
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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