Natural gems stones are formed at high temperature and pressure at depths of 140 to 190 kilometers the Earth’s mantle. and economically important competitor for diamonds. As with the majority of grown diamond substitutes, the idea of producing single-crystal cubic zirconia arose in the minds of scientists seeking a new and versatile material for use in lasers and other optical applications. Its production eventually exceeded that of earlier synthetics, such as synthetic strontium titanate, synthetic rutile, YAG (yttrium aluminum garnet) and GGG (gadolinium gallium garnet).
The natural form of cubic zirconia is so rare, all cubic zirconia used in jewellery has been synthesized, or created by humans.