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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 content markings are based on parts per thousand of pure platinum in the ring. According to the Federal Trade Commission, in the United States, "Platinum" (without additional qualifications) can only be used to mark and describe rings made with at least 950 parts pure platinum throughout.
https://www.consumer.ftc.gov/articles/platinum-gold-and-silver-jewelry
Marketers describe or mark platinum to show the percentage of pure platinum in the piece. 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 …
https://www.braunschweiger.com/what-do-those-markings-on-my-jewelry-mean/
Apr 12, 2018 · 900 900 Plat 100 Irid (platinum) Other markings indicate that an item is not gold at all, such as: RGE or RGP = “rolled gold electroplate” or “rolled gold plate” (gold-plated costume). 1/20 14kt or 12kt = gold-filled jewelry that has 1/20 of gold in it (thicker than costume plating but still not solid gold).Estimated Reading Time: 2 mins
https://www.leaf.tv/articles/how-to-identify-jewelry-markings/
Remember that jewelry marked “900 Platinum” is 90 percent pure platinum, or 900 parts pure platinum out of 1,000. Look for any of these other marks to indicate this type of jewelry: “900 Plat,” “Plat 900,” “Pt900” and “900Pt.” Determine whether jewelry is 100 percent pure gold by …
https://community.ebay.com/t5/Archive-Fine-Jewelry-Gems/Antique-Platinum-ring-marked-RD-PLAT-Real-Hallmark/td-p/2955866
Nov 19, 2012 · It means 90 % platinum, and 10 % Iridum, a low tarnishing metal that platinum is mixed with...nowadays, platinum jewelry is 95% platinum, and 5 % Iridium,and the stamp is usually "PT' for Platinum and 'Irid".Thats a beautiful ring,bids will probably go thru the roof.
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.Author: Kate Miller-Wilson
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.
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