Chocolate Brown Gold
In a special process called PVD (for physical vaporization and deposition), rose gold is turned brown like sausages in a skillet. OK, maybe sausage links aren't the right thing to compare a $10,000 piece of jewelry to (de Grisogono's "Browny Borwn Gold" collection). Out of your price range? QVC has a Chocolate Gold collection that is 14 carat gold coated with "chocolate brown coating." Would that make a brown diamond set in chocolate gold a double chocolate coated carrot cake?