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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.coincommunity.com/forum/topic.asp?TOPIC_ID=231904
Jun 12, 2015 · A variation of "P" for Plumb, assuring full karat purity, for example a full 14K for gold, rather than 13.5 being sufficient. (this does not appear relevant to my ring as "PL" is the ONLY marking, and it appears to be either platinum or silver, not gold, with no karat or fineness number.
https://truval.com/blog/jewelry-identification-marks/
Throughout history, these marks were etched into noble metals to certify their legitimacy, leaving little-to-no question as to where each piece had come from. 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.
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