How is gold made in other colors?

With the introduction of various metals to pure gold, the color can be altered. Believe it or not, gold can be yellow, white, rose, purple, green or blue! Here are the most common formulas of how they make yellow, white and rose colored gold.

18kt yellow gold - 75% gold + 12.5% silver + 12.5% copper
14kt yellow gold - 58% gold + 25% silver + 17% copper

18kt white gold - 75% gold + 5% copper + 15% nickel + 5% zinc

14kt white gold - 58% gold + 20% copper + 14.5% nickel + 7.5% zinc
18kt rose gold - 75% gold + 5% silver + 20% copper
14kt rose gold - 58% gold + 10% silver + 32% copper