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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
After 1973, The Hallmarking Act was initiated, which will now not allow jewelry to be marked platinum if it falls below 950 parts. Many fine contemporary vintage platinum rings with precious gemstones such as tanzanite, sapphires, topaz and diamonds now available due to the popularity of the metal.
https://www.consumer.ftc.gov/articles/platinum-gold-and-silver-jewelry
To be called platinum, an item should be at least 50% pure platinum. Items that have 50% to 85% pure platinum combined with other platinum group metals should say the amount of pure platinum and other platinum group metals. Any item that's less than 50% pure platinum should not …
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
The major platinum jewelry maker and consumer markets today are China, Japan and the United States. 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.
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
Hallmarks are also called assay or standard marking. Hallmarks are distinguishing characteristics that are stamped on gold, silver and platinum items - typically to identify the items purity.
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. A typical platinum hallmark 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://www.specialtymetals.com/blog/2016/6/9/how-to-recognize-platinum-when-you-see-it
Jun 09, 2016 · The fact is, the platinum items you find can have scratches, abrasions, and signs of wear. So keep your eyes open and don’t pass these items by. Myth Two: Platinum Is Always Bright and Shiny Platinum doesn’t tarnish as heavily as silver does, but over time its surface does become cloudy and dull.
https://www.jewelry-secrets.com/Blog/a-ring-with-no-mark-or-stamp/
Dec 02, 2012 · Every now and then we come across a ring that has no stamps or markings inside the ring shank. Usually you’ll see a karat content stamp like 14k (14k gold), PLAT (platinum), or 925 (sterling silver) (see more ring stamps here). But once in a while a customer will bring in a ring that bears no indication of metal or content.
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