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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. PT850 - platinum at 85% . Pt also the chemical symbol - mark for platinum. PLATINUM - indicating mainly platinum. Platine - French or Canadian mark . Dog's Head - French mark indicating 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 for polishing ability and color.
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. Maker’s Marks
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
A 'house' shaped mark is used for platinum items. The number inside the shape is called the millesimal stamp number - this will tell you the actual precious metal content or the purity of the precious metal. Please note - different countries may have different hallmarking standards so the marking you see on your items may differ.
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