Understanding Platinum Markings
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Last newsletter we showed you how to understand silver markings (and in April we showed you how to understand gold markings). This month, we explore standard platinum markings. Platinum is a bright, silver-white metal known to be a solid, secure metal for gem settings. It is 20 times rarer than gold. Rhodium, part of the platinum family, is a metal often used to plate silver, white gold and platinum to produce a brighter, harder finish. The Platinum Group Metals (PGM) includes Platinum, Iridium, Palladium, Ruthenium, Rhodium, and Osmium. Use of the word "Platinum" or any abbreviation must fully disclose any parts of an item that are not 950 parts per thousand of pure Platinum. Acceptable abbreviations for each of the PGM that may be used for quality marks are: "Plat." or "Pt." for Platinum; "Irid." or "Ir." for Iridium; "Pall." or "Pd." for Palladium; "Ruth." or "Ru." for Ruthenium; "Rhod." or "Rh." for Rhodium; and "Osmi." or "Os." for Osmium. The word "Platinum" must follow a number indicating the amount in parts per thousand of pure Platinum. The most commonly seen inscriptions are: "950Pt.," "950Plat.," "900Pt.," "900Plat.," "850Pt.," or "850Plat."
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Lorraine & Jason Venner
Jewelry Mall, PO Box 3302, Redwood City, CA, 94064 ps. This is an opt-in newsletter. If you received the newsletter in error -- or would like to discontinue receiving it, please go to: Unsubscribe
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