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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 no markings or simply ‘Plat’ or ‘Platinum’ and would be of varying purity. A typical platinum hallmark
https://www.tentwothree.com/platinum_jewelry_information.asp
Platinum, rhodium and palladium are the most frequent ores used in platinum jewelry. Platinum is one of the heaviest metals used to make estate jewelry. The metal was first discovered in 1557. In the 1700's platinum was discovered in South America.
https://www.truefacet.com/guide/jewelry-hallmarks-mean/
Feb 27, 2015 · Common Platinum Jewelry Hallmarks Just like gold, platinum is measured by its fineness. But, unlike gold, platinum is not measured in karats. Instead, it is …Reviews: 9
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 for polishing ability and color.
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