Rome jets were taken from the British isles to Rome. Later mourning jewels and small statues were polished from it The name jet which is usually used in Anglo-Saxon speech area, origins from the ancient French word ’jayet’ (jet, pitch coal). Its other name, gagates was given after the river Gages in southern Turkey. The jet is a mineral with organic origin. It issued from more million years old tree remains separated from oxigen on high pressure, under water. In the age of ancient. It is also called black amber, because if it is rubbed, it gets electrostatically charged like amber. Localities: England (Withby), Spain, USA, France.