The rose gold color is a metal made from gold and copper alloy. By adding a dash of copper to the gold, you get a pink hue alloy. You can certainly use the pink and rose gold colors together. The big difference between pink gold and rose gold is the copper content added to the rose gold color to give it that sheen. For more clarity, the rose gold color will consist of 75% gold mixed with 22.5% copper and 2.75% silver, whereas the rose gold color will have the same amount of gold mixed with only 20% copper and 5% silver.