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https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Hallmarks and maker's marks help identify the origin of antique and period platinum rings. Hallmarks, also known as quality or purity marks, guarantee the purity or …
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 ESTATE JEWELRY HALLMARKS. 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 …
https://truval.com/blog/jewelry-identification-marks/
The hallmark, however, differs in that it is like a maker’s brand staple or trademark. Jewelry Makers Marks Silver. Much like gold jewelry maintains a relatively straightforward identification process for …
http://www.nathan-co.co.uk/resources/jewellery-hallmark-information/
Platinum weighing less than 0.5 grams; Compulsory Marks. Hallmarks are made up of 3 compulsory marks. These are the Sponsor's Mark, Fineness Mark and Assay Office Mark. Sponsor's Mark. This is the registered mark of the company or person that sends the item for hallmarking.
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