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https://www.leaf.tv/articles/what-does-pt-stand-for-on-a-gold-chain/
If the jewelry is marked "PL," "PLAT" or "PT," the piece is made of platinum. The symbol for platinum on the periodical table is "Pt." Platinum Alloy. Platinum is a soft metal and, therefore, high-quality jewelry contains a combination of 95 percent platinum and 5 …
https://www.jewelrynotes.com/marks-18-karat-gold/
The common parts-per-thousand mark for 18K jewelry is 750. You might notice that this number is equal to the percentage equivalent of 18 karats (75%) multiplied by 10. In general, to convert a parts-per-thousand number to karats, divide by 1000 and multiply by 24. Marks for 18K …
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
When one finds a purity mark of 18k, it indicates that the alloy to create the jewelry from is made out of 18 parts of gold and 6 parts of other metal. To translate that to percentages we divide 18 by 24 and multiply it by 100. In the case of 18 karat gold, the simple equation will be (18/24) x 100 = 75%.
https://www.leaf.tv/articles/what-are-the-marks-for-18-kt-gold/
A piece marked 18K Plumb or 18KP still means that the piece is 75 percent pure gold. "P" or "Plumb" is simply an old-fashioned term that means that the piece has a gold content level exactly as it is stamped. In the U.S., this means that something marked 18K Plumb or 18KP must be within three parts per thousand of 18 karats.
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · A piece of jewelry with an etching that reads “18k” or “750” indicates that it is made up of 75 percent gold, while a “14k” or “585” mark indicates the metal is constructed with 58.5 percent gold. Detail of maker’s marks on an Italian 18K yellow and rose gold bracelet, mid 20th century.
https://community.ebay.com/t5/Archive-Fine-Jewelry-Gems/18K-White-Gold-or-Platinum-How-to-tell-the-difference/td-p/1311771
Feb 17, 2010 · Older pieces that are a mixture of gold and platinum are also marked accordingly eg. "18ct & Plat" is fairly common in rings. It wasn't until 1975 in england that the hallmarking regulations were applied to Platinum Therefore post 1975 four levels of …
http://www.raregoldjewelry.com/guide-stamps-inscriptions-gold-jewelry
Feb 20, 2013 · Jeweller’s Marks. A lot of jewelry will have several stamps or marks. Often there is one stamp to indicate the purity of the gold (“14K”, as mentioned above). The purity mark can be accompanied by a second mark called a maker’s mark or a jeweller’s stamp. These are custom stamps or engravings placed in jewelry by whomever manufactured it.
https://goodjewelleryguide.com/jewelry-hallmarks-guide/
If you have gold jewelry, you should see markings like 18k, 14k, 10k, 750, 585, or 375. If you have silver jewelry, you should see markings like 925 or 800. Although there are many distinctive features, this is the most clearly distinguished by users.
https://www.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · A platinum hallmark will consist of 3 compulsory and 3 optional stamps. This post is a simple platinum hallmark guide, which we hope you find useful. If you have platinum to sell, please see our up-to-date scrap platinum prices. We also publish our scrap gold prices and our scrap silver prices. The three compulsory platinum marks Sponsor Mark
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