22.11.2011 - How pure is your platinum ring…
Platinum is a precious metal, rarer and more valuable than gold. It is typically used in a very pure form, often as high as 95%. Platinum jewellery falls into three categories of purity, each with its own marking: Platinum, Plat/Pt, and Platinum Group Metal Mixtures. Jewellery that contains at least 95% platinum (or 950 parts per thousand) can be sold as platinum. A piece of this jewellery is marked 'Platinum'. Jewellery that is 85% or 90% pure is marked as 'Plat' or 'Pt', with part per thousand being 850 or 900. For example: '900Pt.' or '850Plat.'..............................................Full Article: Source
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