I'm visual so I had to find a picture. When I was in Italy I don't remember seeing anything like this. However, I didn't jewelry shop there. It's pretty I put a written description below the pictures.
"There's a new craze slowly building out there for chocolate gold. And, no, it does not mean those gold coins kids will be eating tomorrow. Apparently there is a special process called PVD (for physical vaporization and deposition), during which rose gold is bombarded electronically, which makes the metal change color to a molten brown."