The name may be applied to any gold-silver alloy that is 20-80% gold and 20-80% silver, but unless it is the natural alloy, the synthesized metal is more correctly termed 'green gold', 'gold', or 'silver' (depending which metal is present in the higher amount). The ratio of gold to silver in natural electrum varies according to its source. Natural electrum found today in Western Anatolia contains 70% to 90% gold. Most examples of ancient electrum are coins, which contain increasingly lower amounts of gold, so it's believed the raw material was alloyed further to conserve profit.