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Platinum Jewelry: What are PGM and Platinum Marks?

    https://www.liveabout.com/platinum-jewelry-information-2043747
    Aug 17, 2017 · Jewelry that contains at least 950 parts per thousand of pure platinum may be marked or described as "Platinum". Jewelry that contains 850, 900 or 950 parts per thousand of pure platinum may be marked "Plat" or "Pt" …

Platinum : The Science, History, Care, and Story : Arden ...

    https://www.mygemologist.com/learn/jewelry-metals/platinum/
    Jul 26, 2013 · Platinum’s purity endows it with a brilliant white luster. This helps to reflect the true radiance of diamonds. In the United States platinum is usually marked: PT or PLAT. In Europe, …

What Are Some Identifying Marks on a Platinum Ring? LEAFtv

    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. …

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