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https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Jewelry can contain different percentages of pure platinum. The US Federal Trade Commission, FTC, publishes guidelines for acceptable marking standards for platinum jewelry sold in the US. Platinum content is usually expressed as the amount of pure platinum the jewelry contains in parts per thousand.Estimated Reading Time: 3 mins
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.
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.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.leaf.tv/articles/how-to-identify-gold-silver-and-platinum-metals-like-a-jeweler/
Identify platinum by using this list: Plat 900 PLAT 950 PLAT 10% IRID PLAT 10% IRID 90% PLAT COPLAT Identify Palladium by the marking PD. Look at what is stamped after the markings I listed above. Initials, symbols, and names are the hallmarks or trademarks of the manufacturer.
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. But this came a long time after Great Britain’s 14th-century ...
https://jewelry.lovetoknow.com/about-jewelry/understanding-markings-jewelry
Vintage ring with maker's mark and platinum marking If the manufacturer does stamp the piece with metal content, they are required to place their trademark or the retailer's trademark right next to the metal content stamp.
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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