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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 …
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Platinum Content Marks In most countries where platinum jewelry is manufactured, the pure platinum content is at least 85 percent, according to Platinum Today. Makers commonly alloy platinum with the PGM metals—palladium, ruthenium and iridium. Copper and cobalt are also commonly alloyed with platinum …
https://www.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · Platinum hallmarking was introduced in the UK in 1975 as a result of legislation brought about by the Hallmarking Act of 1973. Prior to this date, items containing platinum would often carry …
https://www.tentwothree.com/platinum_jewelry_information.asp
Platinum is in the ore family containing - iridium, palladium, osmiridium and ruthenium. Platinum, rhodium and palladium are the most frequent ores used in platinum jewelry. Platinum is one of the heaviest …
https://www.langantiques.com/university/jewelry-makers-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 …
https://truval.com/blog/jewelry-identification-marks/
Distinguished jewelry requires the proper distinguishing marks. It’s this process of authentication that endorses quality jewelry for what it is: a highly refined work of art. Ornamentation is nothing if not a reflection of one’s personal style, a marking of both taste and creativity. Throughout history, jewelry …
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
Jewelry Maker's Marks Database Traditionally the maker’s mark is the main responsibility mark for the gold (or platinum/silver) content of an artifact. When problems arise, the maker (or company) can be …
https://www.upcounsel.com/jewelry-trademarks
Platinum is usually stamped with the abbreviation PLAT or PT. Gold-filled jewelry is covered with a layer of at least 10-karat gold, and it's often stamped with G.F. or R.G.F. G.E. stands for Gold Electroplate. …
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