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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.
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Rings containing 850 or more parts pure platinum may be described as "platinum" if they use the number "850," or "85% or more" to qualify "Platinum" or its abbreviation in the content marking. Abbreviation marks for other PGMs include: "Plat." or "Pt." for platinum; "Irid." or "Ir." for iridium; "Pall." or "Pd." for palladium; "Ruth." or "Ru."
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
Hallmarks are also called assay or standard marking. 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.
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