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https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Here are some important platinum facts regarding content markings: 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 ...Estimated Reading Time: 3 mins
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.langantiques.com/university/jewelry-makers-mark/
Jewelry Maker’s 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. When such marks are ...
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
On a large percentage of antique jewelry these hallmarks are, due to various reasons, absent and estimations on the origin can only be done through careful observation and, if present, the correct interpretation of accompanying documentation. ... In 1974 a pictorial mark in the form of an orb was introduced as a purity mark for platinum.
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · Jewelry Maker’s Marks: A Brief History. To be considered an antique, a piece of jewelry must be 100 years or older, while vintage jewelry must be more than 20 years old to be classified as such. “Retro” jewelry refers to pieces made during the 1940s and ‘50s and are characterized by the use of large and colorful gemstones.
https://www.langantiques.com/university/platinum-2/
Fusing thin platinum foil to gold was possible though and consequently, this technique marked the first appearance of the metal in jewelry. A patent from 1878 mentions platinum tipped prongs for the setting of diamonds. Around 1890 we start to see gold items that are completely topped with platinum as a precursor to solid platinum jewelry.
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.myclassicjewelry.com/blog/vintage-jewelry-marks/
Aug 15, 2014 · It includes silver marks from many countries and you can access it here: 925-1000 Silver Marks. Vintage Jewelry Marks: Changing with the Times. When learning how to date vintage jewelry, a maker’s mark (or signature) can be a big help, since most companies changed their signatures over time.
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