Term: green gold: a gold alloy (at least 14 karat gold with silver or silver and cadmium) that has a green appearance
Broader: gold: a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia | Unrelated: twinkler: an object that emits or reflects light in an intermittent flickering manner