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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.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://www.tentwothree.com/platinum_jewelry_information.asp
Many estate jewelry hallmarks will be PT900, indicating that the metal is 900 parts per 1000 of pure platinum. The remaining 100 part are usually made with iridium which makes the jewelry harder. 900 Plat - 100Irid - means platinum alloyed with 10% iridium. 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 …
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
A 'house' shaped mark is used for platinum items. The number inside the shape is called the millesimal stamp number - this will tell you the actual precious metal content or the purity of the precious metal. Please note - different countries may have different hallmarking standards so the marking you see on your items may differ.
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · When considering platinum jewelry, the purity mark “950” denotes a composition of 95 percent platinum with a mix of other metal alloys, while “900” is made up of 90 percent platinum, and “850” has 85 percent platinum.
https://www.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · Platinum hallmarking was introduced in the UK in 1975 as a result of legislation brought about by the Hallmarking Act of 1973. Prior to this date, items containing platinum would often carry no markings or simply ‘Plat’ or ‘Platinum’ and would be of varying purity. A typical platinum hallmark
https://truval.com/blog/jewelry-identification-marks-hallmarks-makers-marks/
Markings are typically found on items made of silver, gold, platinum, and though small in size, they have quite a serious impact on an item’s worth. In 1906, the United States mandated that jewelers add a purity mark on their wares in the National Gold and Silver Stamping Act.
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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https://www.yellowpages.com/maroa-il/jewelry-buyers
From Business: Anderson Jewelers provides diamond jewelry, bridal jewelry, 14K yellow gold and white gold jewelry, engagement rings, wedding bands, platinum jewelry, diamonds… 14. Presidential Coins, Currency, Gold & Silver
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