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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 front of the term to disclose the amount of pure platinum in the mix, such as : "850 Plat" or "850 Pt", orEstimated Reading Time: 3 mins
https://www.afashionblog.com/platinum-ring-stamp-meanings/
What hallmarks or stamp on platinum rings or platinum jewelry? How, then, do you identify jewelry made of platinum? Well, there are platinum content marks, as mentioned above. And in most of the countries that manufacture platinum jewelry, the highest (purest) platinum content is 85% minimum.Estimated Reading Time: 8 mins
https://platinumjewelry.com/why-platinum/pure/
Look inside a piece of platinum jewelry and you’ll see its purity stamp. The Federal Trade Commission demands specific marks for the content of any precious metal alloy. To protect American consumers, a high-content platinum alloy will be marked 950Pt, 950, plat or platinum, meaning that it’s at least 95% pure, elemental platinum.
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://thinkengraved.com/blogs/news/a-guide-to-what-jewelry-stamps-mean
Apr 29, 2021 · For gold, the stamps are 375, 585, 750, 916, 990 and 999. For silver, the stamps are 800,925,958 and 999. For platinum, the stamps are 850, 900, 950 and 999. Please refer to the photo to see what the stamps look like as well as the essay’s office stamp. That covers the most common stamps on gold jewelry. There may be some other variations or ...
https://www.brilliance.com/education/metals/platinum
If you're examining a piece of jewelry forged from a precious metal, look for the hallmark as a way of indicating its purity. Pure platinum is often marked simply with the letters 'PLT', 'PLAT', or 'PLATINUM', which indicates that the piece consists of at least 95% platinum.
https://www.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · Prior to this date, items containing platinum would often carry no markings or simply ‘Plat’ or ‘Platinum’ and would be of varying purity. All platinum items weighing more than 0.5 grams must now carry a valid hallmark when sold in the UK. The photo on the right shows a typical hallmark.
https://orchid.ganoksin.com/t/platinum-ring-stamped-iridplat/28373
If the piece is at least 75% platinum and the rest of the make-up is of platinum group metals (irridium, palladium,ruthenium, rhodium, or osmium) then the piece can be stamped platinum, but must be preceded by the abbreviation for the other predominant metal (in
https://www.silverrecyclers.com/blog/950-platinum.aspx
Markings are easy to spot for any type of platinum piece. You should clearly see "Platinum", "Plat", or "PT" engraved on the piece followed by the number 950. On jewelry the number may be small and concealed, but it should still be visible. The Value of Your 950 platinum
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