electrum

Electrum is a naturally occurring alloy of gold and silver, with trace amounts of copper and other metals. Colour ranges from pale to bright yellow, depending on the proportions of gold and silver. Gold content of naturally-occurring electrum in modern Western Anatolia ranges from 70% to 90% in contrast to the 45-55% of electrum used in ancient Lydian coinage of the same geographical area.[1]
See more at Wikipedia.org...

Noun
1. an alloy of gold and silver
(hypernym) alloy, metal

n. electrum

(n.)
German-silver plate. See German silver, under German.
  

(n.)
An alloy of gold and silver, of an amber color, used by the ancients.
  

(n.)
Amber.
  

N
electrum (alloy of gold and silver); amber; electron (Cal)