Rose gold is made from a gold and copper alloy. Since copper has a bold pinkish-orange color, adding this metal to gold gives the finished product a beautiful pinkish gold color. With 18 karat rose gold contains 75% gold while 14 karat rose gold contains 58% gold. The remaining percentages are made up of copper or an alloy of copper and silver. The varying percentages of copper used determines the color of the gold. The more copper that is used, the stronger the rose color. There is no such thing as pure rose gold, since rose gold is an alloy of gold and copper and silver.