The entrance gateway, like those of the Grand Bazaar and the Masjed-e Shah, was a recessed half-moon. Also, as in the Masjed-e Shah, the lower façade of the mosque and the gateway are constructed of marble, while the "haft-rangi" tiles (Persian: هفت‌رنگی, lit. "seven-coloured", "polychrome mosaics") decorate the upper parts of the structure. The creation of the calligraphy and tiles, which exceed, in both beauty and quality, anything previously created in the Islamic world, was overseen by Master calligrapher Ali Reza Abbasi.