Diamagnetic domains called "Condon domains" are investigaited.The origin of these domains is Landau levels arising in a magnetic field and low temperatures in the perfect crystals leading to the de Haas-van Alphen (dHvA) effect and domains arising in non-magnetic metals. The differet methods were used. For the first time, by muons the domains were found in all measured metals; by micro-Hall probes domain sructutr was detected on silver; magnetostriction was measured in beryllium; hysteresis was observed in dHvA effect and experimental phase diagram of the Condon domain state are determined...