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https://www.specialtymetals.com/blog/2016/6/9/how-to-recognize-platinum-when-you-see-it
Jun 09, 2016 · Send It to Us for Testing. If you have a silver-toned item that could be made of platinum, call us at 800-426-2344 and ask us to test it for you. When you do, ask about shipping costs. Your items could qualify for free or discounted shipping when you send them to us.Estimated Reading Time: 2 mins
https://style.visualstories.com/how-to-identify-platinum-jewelry
A good way to recognize platinum is to check their weight. Platinum is almost double the weight of silver jewelry of the same value. So, if you have silver jewelry at hand which is of the same volume or if you are familiar with the properties of silver jewelry, you should be able to identify platinum.
https://kipkis.com/Identify_Platinum_and_Silver_Jewelry
Feb 05, 2018 · Therefore, all platinum jewelry will be marked to show authenticity. Look for the words “Platinum”, “PLAT”, or “PT” followed or preceded by the numbers “950” or “999”. These numbers refer to the purity of the platinum, with “999” as the most pure. For example, an authentic piece of platinum jewelry might have a stamp reading “PLAT999”.
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