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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 pure platinum may be marked or described as "Platinum". Jewelry that contains 850, 900 or 950 parts per thousand of pure platinum may be marked "Plat" or "Pt" if a number is used in front of the term to disclose the amount of pure 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 …
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 alloyed with 10% iridium.
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 alloyed with 10% iridium. PT850 - platinum at 85%
http://www.topdogscrapgold.co.uk/article/guide-platinum-hallmarks
Platinum hallmarking was brought into the UK during 1975 as a result of legislation brought about by the Hallmarking Act of 1973. Before this date, jewellery containing platinum would often have no markings whatsoever or simply ‘Plat’ or ‘Platinum’ and would be of varying purity. If this is the case then a melt and assay would have to ...
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. You can find these hallmarks in a variety of places.
https://www.wikihow.com/Identify-Quality-in-Platinum-Rings
Oct 04, 2020 · Platinum is the high-quality standard for wedding bands, engagement rings, and other fine jewelry. Its durability, natural white-silver finish, and density make this rare metal desirable in rings for both men and women. However, platinum...Views: 120K
https://www.langantiques.com/university/jewelry-makers-mark/
Maker’s marks are the initials or name of the manufacturing firm or other representative symbol stamped into a gold , silver or platinum item. Also called ‘Trademarks,’ they often provide the only evidence that a certain piece of jewelry has indeed been manufactured by a certain jewelry maker.
https://truval.com/blog/jewelry-identification-marks/
Throughout history, these marks were etched into noble metals to certify their legitimacy, leaving little-to-no question as to where each piece had come from. Markings are typically found on items made of silver, gold, platinum, and though small in size, they have quite a serious impact on an item’s worth.
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