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https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · 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", or "950 Plat" or "950 Pt"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.consumer.ftc.gov/articles/platinum-gold-and-silver-jewelry
To be called platinum, an item should be at least 50% pure platinum. Items that have 50% to 85% pure platinum combined with other platinum group metals should say the amount of pure platinum and other platinum group metals. Any item that's less than 50% pure platinum should not be marked or labeled as "platinum."
https://www.leaf.tv/articles/what-are-some-identifying-marks-on-a-platinum-ring/
Platinum Content Marks In most countries where platinum jewelry is manufactured, the pure platinum content is at least 85 percent, according to Platinum Today. Makers commonly alloy platinum with the PGM metals—palladium, ruthenium and iridium. Copper and cobalt are also commonly alloyed with platinum for polishing ability and color.
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.
https://jewellerista.com/platinum-jewellery/
Jul 02, 2018 · Platinum is best paired with diamonds. Platinum’s own sheen and luster add to the brilliance of a diamond, and due to its strength and non-reactive nature, is the preferred metal setting for diamond jewellery. Platinum is 30 times rarer than gold (certainly rarer than silver), thus more expensive and more desirable.Estimated Reading Time: 8 mins
https://www.gold-traders.co.uk/blog/simple-platinum-hallmark-guide/
Mar 14, 2011 · High-end and specialist precious metal dealers use XRF (X-ray fluorescence) testing to accurately identify the platinum content of jewellery. Inductively coupled plasma, optical emission spectrometry is used by assay offices during the hallmarking process. Tags: Guide, hallmark, Hallmarks, Platinum March 14th, 2011 Hallmarks, Platinum
https://www.leaf.tv/articles/how-to-test-jewelry-gold-platinum-palladium/
Ten-karat gold is marked 10k, 16, 417, or 10KP; 14-karat gold is marked 583, 585, or 14KP; 18-karat gold is marked 750 or 18KP; 22-karat gold is marked 916 or 917; and pure gold, 24 karat, is marked 999. Marked platinum will say 900 Plat, Plat 900, Pt900, or 900Pt. Modern palladium is usually marked …
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