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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 platinum group metals, with at least 500 parts per thousand of the total pure platinum, may be marked as platinum as long as the numbers of each metal are disclosed.Estimated Reading Time: 3 mins
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.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.sellyourgold.com/faq/my-items-gold-silver-or-platinum
An oval stamp would indicate the item is silver. A 'house' shaped mark is used for platinum items. The number inside the shape is called the millesimal stamp number - this will tell you the actual precious metal content or the purity of the precious metal.
https://www.consumer.ftc.gov/articles/platinum-gold-and-silver-jewelry
Also get to know the common phrases and markings used to describe the type of jewelry you’re looking for. That will make it easier for you to decide whether a piece of jewelry is worth the price. Platinum Jewelry. Platinum jewelry is rarely made with 100% pure platinum. Instead, platinum is mixed with similar metals or non-precious base metals.
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-identify-gold-silver-and-platinum-metals-like-a-jeweler/
Identify sterling silver by finding the number 925. Some items that appear to be gold but have the 925 stamp are made of gold-plated sterling silver. Identify platinum by using this list: Plat 900 PLAT 950 PLAT 10% IRID PLAT 10% IRID 90% PLAT COPLAT. Identify Palladium by the marking PD. Look at what is stamped after the markings I listed above ...
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · When considering platinum jewelry, the purity mark “950” denotes a composition of 95 percent platinum with a mix of other metal alloys, while “900” is made up of 90 percent platinum, and “850” has 85 percent platinum.
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 …
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