Microscopy revealed that the glass used in these windows was imported from Europe, which corresponded to industry changes noted in nineteenth-century sources. Unlike the crown-blown glass historically produced in Egypt, such imported glass was first manufactured as broadsheets cut from cylindrical forms and shipped at cheap prices from producers in Bohemia and Germany, among other suppliers. Regional sellers of foreign-made glass (ballūr) in Egypt and Syria supplied artisans known as qamarjī, who specialized in stucco window crafts. These artisans would keep their workshops well stocked with glass in a wide variety of sizes, which were colored according to the requirements of their projects. To further customize the glass, the qamarjī would use a diamond tipped stylus (ʿalmāsa) mounted on a piece of bone, similar to the nib of a pen, to cut the piece to size and smooth jagged edges. Given the importance of this diamond glass-cutter to his work, the qamarjī always wore this implement around his neck.