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Platinum is a soft, silvery white metal. It is more expensive than gold, and more difficult to work with. Besides jewellery, platinum is used in laboratory equipment and electrical components.
Platinum is often used in jewellery, most often jewellery with diamonds. The rarest diamonds, and therefore also the most expensive ones, are the one with the least colour (“whitest”). One doesn’t set these stones in yellow gold, because the yellow colour may make the diamond look like it has a lesser quality. Platinum has to be mixed with other metals to make it hard enough to be functional in jewellery. The alloy has to contain at least 900/1000 platinum, and punchmarked 900PT. Platinum jewellery should be treated and cleaned in the same way as gold jewellery. Ailin Roelvaag 2009 Bibliography 
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