Apparently there was a Napoleonic commemorative table medal struck to celebrate the conquest of upper Egypt with this motif. The palm and crocodile was used on Romano-African coinage. Given the Sudanese ability to make decent metalwork I think a star or gold chain would easily have been made in Khartoum in 1837. Rummaging through old Antiques Magazines on African art there is a plethora of brass work, bangles, necklaces, leg bracelets, swords, daggers etc. etc.. all with decoration and some are enameled. Why not?