The use of gold dates back to the prehistoric times. The first written history of gold dates to around 2600 BC in Egypt where gold was used as a valuable item for art, adornment, money, and in decorating burial masks and coffins.
In the earliest history gold was represented by the symbol of the sun. The color of gold was compared to the glow of the sun. This is where the word gold comes from. You would have to have an extensive education in language to trace the actual beginning of the word usage of gold. In Spanish history the word for the sun is Sol and the color of Sol was Oro, which is the word gold. The earliest English usage was the Gothic word gulth.