Tell El Luli is an important archaeological site in North Sinai. It holds pottery artifacts and Roman baths built of red brick dating back to the Roman period. The North Sinai excavation missions by the Ministry of Antiquities in Egypt" discovered many pottery artifacts. Diagnostic investigations were conducted on the pottery shards samples from Tell El Luli to determine the matrix microstructure aspects and their various characteristics. Multi-analytical methods, such as stereoscopic microscope, polarized microscope, scanning electron microscope (SEM- EDX), X-ray diffraction, and X-ray fluorescence were used in the research. Based on the diagnostic investigations, the research demonstrated that the raw material was Nile clay, the additives were grog, added sand, dolomite powder, and burnt straw, and the surface treatment was slip layer and red wash. Additionally, it was proven that the burning atmosphere was an oxidizing and reducing atmosphere. Pottery suffered from severe damage, such as crystalline salts, cracks, gaps, soiling accumulations, calcifications, dirt accumulations, flaking, weak structure, and fragility. The pottery artifacts were restored, and the soil accumulations were cleaned mechanically and then chemically. The salts were extracted using various poultices. Thus, consolidation was conducted by nanosilica (0.5%). The assemblage process was carried out using Paraloid B72 at a (50%) concentration.