Precious Metals Management: FAQs: How can I check that an item is made of platinum? - PMM

This website uses cookies. By continuing to browse this site you are agreeing to our use of cookies. Find out more about cookies

How can I check that an item is made of platinum?

Johnson Matthey recommends that you always purchase platinum products from a reputable source and that you always verify hallmarks and serial numbers wherever possible.  A quick and very approximate test you can perform to check the genuineness of a platinum bar is to measure the dimensions of the piece in centimetres. Multiply together to give the volume. Multiply the volume by the density of platinum, 21.45 gm/cc. This will give you the theoretical weight that the bar should be if it is really platinum. If the actual weight is less than 85% of theoretical it is probable that it is not platinum.