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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", or
https://www.sellyourgold.com/faq/my-items-gold-silver-or-platinum
Code Meaning; GF: Gold Filled: P: Plumb Gold (this shows the item is at least the amount of karats shown on the stamp) KP: Karat Plumb (this means the item is at least the karat listed, but may be more pure) Pd: Palladium: PT: Platinum: PLAT: Platinum: Silver: Sterling Silver: SS: Stainless Steel: St Steel: Stainless Steel: cw
https://siccode.com/sic-code/5094/jewelry-watches-precious-stones-precious-metals
SIC Code 5094 - Jewelry, Watches, Precious Stones, and Precious Metals is a final level code of the “ Wholesale Trade ” Division. There are 3,587 companies classified in this industry in the USA with an estimated employment of 122,171 people.
https://www.thoughtco.com/metal-jewelry-stamps-and-marks-608017
Feb 12, 2020 · The quality marks for palladium are applied to articles composed of at least 95% palladium, or 90% palladium and 5% platinum, iridium, ruthenium, rhodium, osmium or gold. View Article Sources "Guides for the Jewelry, Precious Metals, and Pewter Industries."
https://mjsa.org/publicationsmedia/compliance_guides/stamping_and_marking
• Alloys containing at least 500 and less than 850 parts per thousand of platinum, and at least 950 parts per thousand of platinum group metals (PGMs): This jewelry can be described and marked platinum, or an abbreviation, but the name and amount of each platinum group metal must be indicated (e.g., "600Pt./350Ir."; "550Plat./350Ru./50Irid.").
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