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Gold (Au) is one of the most expensive precious metals and is a very favored material in jewelry making, not only because of its warm shine but also because its surface does not tarnish. 24K gold (99.9% gold) is thus rarely used as raw material for jewellery. A harder alloy with 75.0% gold is preferred. Depending on the desired colour of the jewellery, either copper and/or silver or platinum will be added.
Zirconia (molecular formula: ZrO2, Zirconium dioxide) is synthetic substitute for diamond . Its hardness is almost as high as the one of diamond (8.5 as opposed to 10) which makes it resistable. However, it may scratch other material easily. Zirconia can be produced in different colours and levels of transparency. It is normally cut in faces (in the same way as glass).