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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 platinum group metals, with at least 500 parts per thousand of the total pure platinum, may be marked as platinum as long as the numbers of each metal are disclosed.Estimated Reading Time: 3 mins
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.
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 metals used to make estate jewelry. The metal was first discovered in 1557.
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
Hallmarks are distinguishing characteristics that are stamped on gold, silver and platinum items - typically to identify the items purity. There are also hallmarks that can identify where the item was made (called a makers mark), the office the metal was tested in, the year, and the designer.
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.
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.langantiques.com/university/hallmarks-on-period-jewelry/
From 1912 a dog’s head is used as the mark for platinum. Although the French law requires all gold jewelry to have a minimum purity of 18 karat, items that are intended for export may be marked with the pictorial marks for 9k and 14k. French Export Mark from 1840 to 1879. Image Courtesy of the Hallmark Research Institute.
https://truval.com/blog/jewelry-identification-marks-hallmarks-makers-marks/
Jewelry Makers Marks Silver. Much like gold jewelry maintains a relatively straightforward identification process for karat content, so does silver. Sterling silver, for instance, will have a mark of ‘925.’. This signifies that the piece of jewelry maintains a silver content of no less than 92.5% silver. back to blog.
https://www.langantiques.com/university/oscar-heyman-bros/
Oscar Heyman & Bros. is an American jewelry firm and manufacturer that first gained attention in the 1920’s. In 1906, Oscar and Nathan Heyman immigrated to the United States from Latvia. 1 Thanks to an apprenticeship at their great-uncle’s Fabergé workshop, they arrived with a skill that made them instantly employable: they could work with platinum, a metal relatively new at the time.
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