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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".
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Copper and cobalt are also commonly alloyed with platinum for polishing ability and color. Just 5 percent of an alloy metal can give soft platinum the necessary hardness for a ring, according to 1 Wedding Band. Platinum content markings are based on parts per thousand of pure platinum in the ring.
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.consumer.ftc.gov/articles/0294-platinum-jewelry
These platinum/base metal alloys contain from 50 to 85% pure platinum, but the total of pure platinum and other platinum group metals is less than 95%. Labels for this jewelry should include the amounts of pure platinum and other metals in the piece using the full name of each metal and its percentage.
https://www.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · Prior to this date, items containing platinum would often carry no markings or simply ‘Plat’ or ‘Platinum’ and would be of varying purity. A typical platinum hallmark All platinum items weighing more than 0.5 grams must now carry a valid hallmark when sold in the UK. The photo on the right shows a typical hallmark.
https://truval.com/blog/jewelry-identification-marks/
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. In 1906, the United States mandated that jewelers add a purity mark on their wares in the National Gold and Silver Stamping Act.
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
Hallmarks are also called assay or standard marking. Hallmarks are distinguishing characteristics that are stamped on gold, silver and platinum items - typically to identify the items purity.
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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