Casket in the form of a Mosque, Ottoman Turkey, 18th century (gemset silver-gilt)

The hinged casket of architectural form, heavily set with rubies, emeralds, garnets and other coloured stones, the base with stylised reeds dotted with inset gems, a fluted minaret at each corner with dome finials, the sides intricately decorated with various architectural elements including minbars, shrines, minarets and altars, some of the windows with Ottoman cenotaphs and a candlestick visible through them, occasional flights of birds and trees around the sides, some sides with hinged porticos and windows, the hinged lid with an elaborate domed structure surmounted by a crescent with semi-domes on each side, four barrel-vaulted structures at the corners, the base formed of a thick onyx panel, a plaque with the tughra of Mahmud I once attached to the interior of the lid now separate but retained.