Diadema is a municipality in São Paulo state, Brazil. Belangin tae the ABC Region o Greater São Paulo, it is 17 km (11 mi) distant frae São Paulo's central point. Initially pairt o São Bernardo do Campo, Diadema became a ceety o its awn in 1959. The ceety haes an aurie o 30.65 square kilometres (11.83 sq mi) an a population o 386,039, the 14t lairgest in the state. Entirely urbanisit, the annual mean temperatur in the ceety is 19,6°C (67,3°F). Its HDI is 0.790.
Awtho locatit in the hert o a tradeetionally industrial region, its main source o income is the service sector, featurin 77 halthcare installations. Diadema is still hame tae a butterfly zoo, a botanical garden, an airt museum an a observatory.