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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.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%
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. Platinum Content Marks In most countries where platinum jewelry is manufactured, the pure platinum content is at least 85 percent, according to Platinum Today.
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
Hallmarks are distinguishing characteristics that are stamped on gold, silver and platinum items - typically to identify the items purity. There are also hallmarks that can identify where the item was made (called a makers mark), the office the metal was tested in, the year, and the designer.
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://jewelry.lovetoknow.com/Platinum_Jewelry
Tips for Authenticating Platinum Jewelry All contemporary platinum and most vintage platinum will be marked to indicate that it's authentic. Most platinum contains at least 85% of pure platinum within its compound structure, though percentages can reach as high as 99.9% purity.Estimated Reading Time: 5 mins
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://platinumjewelry.com/
Welcome To Platinum Jewelry. Platinum Guild International (PGI) is your resource for all things platinum jewelry – from platinum information to wedding jewelry buying tips. Our mission is to inspire jewelers and customers alike to build an enduring commitment for platinum that withstands the test of time. Learn More.
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