| Unless he's thinking of the"pink gold" that jewelers sell; and I don't know what the additional element(s) might be in that to get the colour.
Edit: OK, a little homework was in order.
Rose Gold Jewelry
What is Rose Gold?
Rose gold, also known as pink gold or red gold, is a mixture of pure yellow gold with a high percentage of copper. It has a very subtle and delicate color that may intensify somewhat with age due to a slight, but attractive, tarnishing of the copper.
Rose gold is created by increasing the copper-colored alloys mixed with the gold and decreasing the silver-colored alloys. 14K rose gold contains as much pure gold as 14K yellow gold but, because of the increased copper, is slightly pinker in color. Rose gold is available in 9K, 14K and in 18K gold. |