Khatamkari is a type of decoration created by the intricate arrangement of triangles made from wood, bone and metal, which together form geometric patterns. The object under discussion is a square mirror related to the Qajar period and is privately owned. According to the experiments carried out to identify the materials comprising the artifact, it was found that it consists of wood (jujube, walnut, Iranian pine, poplar or Tabrizi and plantain), bone, and metal (silver and brass), and the triangles were made of Brass, bone and wood, and the layers used are of silver, and underlying structure is of wood. The damages observed on this artifact include corrosion products forming in the parts where the silver metal has been applied, darkening of the polish, distortion and separation of connections in the underlying structure, and distortion and separation and shedding in some parts, which these damages have led to the deterioration of patterns. After removing the previous incorrect repairs and cleaning the darkened polish and strengthening the distortion of the underlying structure and inlay decorations, reconstruction, balancing and final strengthening have been done.