Green gold is a very pale yellowish sage color. It is made of 10 parts pure gold and 14 parts of a mixture containing primarily silver.
In 862 BC, the Lydians, an Iron Age kingdom in present-day Turkey, were using coins made of electrum. This naturally occurring gold-silver alloy consisted of 73% gold and 27% silver.
Green Gold from Krikawa
We most commonly use green gold in Winter mokume gane, but have also handcrafted some engagement rings in green gold. We have determined that 10 karat green gold yields the best color. Higher karats of green gold look more yellow than green.