According to Nokia, they have special fans who are looking for exclusive products to be held as a collection or for fun. That's why the Nokia Oro made. Still according to Nokia, that particular fans are mostly located in Russia and Asia.
Nokia Oro is the expensive version of the Nokia C7 which carry a 3.7 inches screen, a 8MP main camera, HSDPA support and runs on the Symbian^3 platform. The rest there is no difference at all, rather than mere gold dressing on the side and rear.