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https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Here are some important platinum facts regarding content markings: Jewelry that contains at least 950 parts per thousand of pure platinum may be marked or described as "Platinum".
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Platinum content markings are based on parts per thousand of pure platinum in the 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.
https://www.tentwothree.com/platinum_jewelry_information.asp
Platinum does not tarnish, unlike silver. Rhodium is often used as a coating material, because it is a very hard metal. Rhodium is abbreviated Rh. Frequently sterling silver jewelry is coated with rhodium to strengthen the piece. PLATINUM ESTATE JEWELRY HALLMARKS. Many estate jewelry hallmarks will be PT900, indicating that the metal is 900 ...
https://www.specialtymetals.com/blog/2014/5/2/how-much-platinum-does-your-platinum-jewelry-really-contain
May 02, 2014 · Understanding the Markings on Pieces of Platinum Jewelry If an item is simply stamped as “platinum,” “plat,” or “pt.” with no other markings, that means that it contains at least 95% pure platinum - if it was legally sold in America. If it is stamped with a marking like “850Plat,” that means that it contains 85% pure platinum.
https://www.leaf.tv/articles/how-to-identify-a-platinum-ring/
If the shank has a visible, "PT" symbol, reads "900 PLAT"or has "950 PLAT" markings, then the ring is definitely platinum. If the ring shows a 9K, 10K, 14K, 18K, 22K, with or without a series of three numbers, then the ring is not platinum. If the inside shank reads GF, GE, HGE, RGP or GP, the ring is not platinum. Place the ring over heat.
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · The study of jewelry maker’s marks is a fascinating subject, steeped in history, culture, and art. Often overlooked due to their intentionally hidden location and diminutive size, the etchings found inscribed on a piece of modern or vintage jewelry offer a window into the “who, what, and where” of the piece – and are well worth a serious look.
https://truval.com/blog/jewelry-identification-marks/
Markings are typically found on items made of silver, gold, platinum, and though small in size, they have quite a serious impact on an item’s worth. In 1906, the United States mandated that jewelers add a purity mark on their wares in the National Gold and Silver Stamping Act.
https://www.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Platinum hallmarking was introduced in the UK in 1975 as a result of legislation brought about by the Hallmarking Act of 1973. Prior to this date, items containing platinum would often carry no markings or simply ‘Plat’ or ‘Platinum’ and would be of varying purity. A typical platinum hallmark
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