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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 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" if a number is used in …
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Platinum rings and ornaments date more than 2,000 years, and the culture of platinum ring-making over the centuries has led to various traditions in jewelry marking.
https://www.consumer.ftc.gov/articles/0294-platinum-jewelry
Platinum jewelry should be labeled so you can tell how much platinum there is in the piece. Any jewelry that is not labeled platinum, plat., or pt. contains less than 50% pure platinum …
https://www.jewelrynotes.com/find-out-if-your-jewelry-is-gold-plated/
Gold Plated Jewelry Markings Looking at gold markings is one of the fastest ways to establish what your jewelry is made of. Looking at gold markings is one of the fastest ways to establish what your jewelry is made of. The most common stamp used in gold-plated jewelry is …
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
Inspect the Hallmark Hallmarks are also called assay or standard marking. Hallmarks are distinguishing characteristics that are stamped on gold, silver and platinum items - …
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