Chemically, gold is a transition metal, with symbol Au, of which a total of about 200.000 tonnes is in existence above ground. Rather rare.
(…) The historical value of gold was rooted in its medium rarity, easy handling and minting, easy smelting, corrosion resistance, distinct color, and non-reactivity to other elements. (wikipedia) Rather solid.
The color gold has been coined the color of the year 2016 by Color Futures.