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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. Pt also the chemical symbol - mark for platinum.
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 quality of a precious metal. They are expressed with numbers, symbols, letters or a combination thereof stamped, impressed or struck on platinum to indicate its fineness, according ...
https://www.truefacet.com/guide/jewelry-hallmarks-mean/
Feb 27, 2015 · The fineness hallmarks for platinum are as follows: Common Silver Jewelry Hallmarks While silver is pure, sterling silver is an alloy of pure silver and another metal. Therefore when it comes to silver hallmarks, silver is measured by its fineness and marked accordingly.Reviews: 9
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
Hallmarks on Period Jewelry. For estate jewelers and jewelry historians, hallmarks provide for an extra source of information to accurately date a jewelry object and determine by whom it was made. The most encountered hallmark on jewelry is undoubtedly the “purity” mark which indicates the total amount of gold or silver used to manufacture ...
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