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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 :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. 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.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. Pt also the chemical symbol - mark for platinum.
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
A Makers Mark is the designer, manufacturing firm or representative symbol that is stamped into your precious metal - also called trademarks. This mark provides proof that your jewelry item was made by the designer or jewelry maker and is considered "signed". All marks …
https://www.tiffany.com/jewelry/shop/platinum-jewelry/
Platinum Jewelry Our elegant platinum jewelry elevates day and evening looks alike. Explore our classic and contemporary designs, from platinum rings to platinum earrings, necklaces and bracelets—all sure to stand the test of time.
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
https://www.langantiques.com/university/jewelry-makers-mark/
Jewelry Maker’s Mark. Maker’s marks are the initials or name of the manufacturing firm or other representative symbol stamped into a gold , silver or platinum item. Also called ‘Trademarks,’ they often provide the only evidence that a certain piece of jewelry has indeed been manufactured by a certain jewelry maker. When such marks are ...
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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