Definition of gold? Gold is a dense, soft, flexible metal. It is a bright yellow colour that is considered attractive, which is maintained without tarnishing in air or water. Interesting Information about Gold Gold was discovered about 5000 years ago and is a metal that is admired and valued for its usefulness and beauty. Although it is very heavy, gold is very soft and can easily be shaped by flattening it into sheets, or by stretching it into wires.