On the mobile version of the game, the coins dropped are the same colour as regular coins but still provide a 10x bonus. The effect works on regular monsters, Treasure Chests, Clickables and Bosses. And works in addition with other ancients like Libertas, Mimzee and Mammon. Because the effect works on Treasure Chests, it can give you a huge boost in your gold count when both the chest chance and fortune chance overlap.