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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 in the mix, such as : "850 Plat" or "850 Pt", orEstimated Reading Time: 3 mins
https://www.tentwothree.com/platinum_jewelry_information.asp
Estate jewelry made of platinum is very popular because there is generally very little show of aging or wear. The estate and antique filigree engagement rings of the 1920s and the 1930s were often made with platinum because of the durability of the metal. METAL COMPARISIONS.
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Rings containing 850 or more parts pure platinum may be described as "platinum" if they use the number "850," or "85% or more" to qualify "Platinum" or its abbreviation in the content marking. Abbreviation marks for other PGMs include: "Plat." or "Pt." for platinum; "Irid." or "Ir." for iridium; "Pall." or "Pd." for palladium; "Ruth." or "Ru."
https://www.leaf.tv/articles/how-to-identify-jewelry-markings/
Remember that jewelry marked “900 Platinum” is 90 percent pure platinum, or 900 parts pure platinum out of 1,000. Look for any of these other marks to indicate this type of jewelry: “900 Plat,” “Plat 900,” “Pt900” and “900Pt.” Determine whether jewelry is 100 percent pure gold by …
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. 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.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · Purity marks on gold jewelry will consist of a two-digit number followed by the letter “k,” or a three-digit number. The letter “k” refers to karats, where pure gold is composed of 24 karats (24k).
https://www.truefacet.com/guide/jewelry-hallmarks-mean/
Feb 27, 2015 · Common Gold Jewelry Hallmarks Pure gold is 24 karats and is stamped as 999 to indicate its higher gold to alloy ratio. As we move down the scale of gold purity, 20 karat gold is stamped as 833 to represent the 20:24 (or.833) gold to alloy ratio.
https://thinkengraved.com/blogs/news/a-guide-to-what-jewelry-stamps-mean
Apr 29, 2021 · 90% platinum or 900 parts per 100. Usually mixed with other platinum metal group alloys such as Ruthenium, rhodium, or palladium. 950 platinum will simply carry 950 in place of the 900 and is 950 parts per 1000 pure platinum. Here is a great article about the above stamps here.
https://jewelry.lovetoknow.com/about-jewelry/understanding-markings-jewelry
Vintage ring with maker's mark and platinum marking If the manufacturer does stamp the piece with metal content, they are required to place their trademark or the retailer's trademark right next to …
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