As a synthetic gemstone, cubic zirconia comes in a large array of colours, from colourless to black. The wide colour range is caused by colouring agents added to the source powder during the growth process.
If the colouring agent is caesium, the cubic zirconia turns yellow, orange or red depending on the concentration of the microelements. In the case of copper, iron, nickel and titanium, we get yellow, amber and brown colours.
Lilac, violet, purple and blue cubic zirconia is caused by various combinations of cobalt, manganese and neodymium microelements. The pink colour is due to the presence of erbium, europium and holmium, while green is caused due to chromium, thulium and vanadium.