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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://jewelry.darienicerink.com/what-is-the-symbol-for-platinum-on-jewelry/
May 09, 2021 · The alchemical symbol for platinum was made by joining the symbols of silver and gold. Source: brilliancejewels.com. In chemistry, platinum is element number 78, and its atoms have an atomic weight of 195 a.m.u. Source: 1.bp.blogspot.com. The symbol for platinum is pt, from spanish platina meaning little silver.
https://www.tentwothree.com/platinum_jewelry_information.asp
PT850 - platinum at 85% . Pt also the chemical symbol - mark for platinum. PLATINUM - indicating mainly platinum. Platine - French or Canadian mark . Dog's Head - French mark indicating platinum used after 1912. PT950 - platinum. Indicating that 950 parts per 1000 containing platinum. After 1973, The Hallmarking Act was initiated, which will now not allow jewelry to be marked platinum if it falls below …
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Such a ring may simply read "Platinum," "Plat" or "Pt," or may be marked "95% Plat," "950 Plat" or "950 Pt." 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."
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