About Cubic Zirconium ( CZ ) Cubic Zirconium, or CZ, is very popular and widely known and used in the jewelry industry. Cubic Zirconium which was invented by the Russians in 1937, is a top quality man made gem. It is quite remarkable the actual process of manufacturing of rough CZ, which is melted at extremely high temperature and then cooled to form flawless diamonds. This Cubic Zirconium is...