<P> The interior of the dome is lavishly decorated with mosaic, faience and marble, much of which was added several centuries after its completion . It also contains Qur'anic inscriptions . Surah Ya Sin (the "Heart of the Quran") is inscribed across the top of the tile work and was commissioned in the 16th century by Suleiman the Magnificent . Al - Isra, the Surah 17 which tells the story of the Isra or Night Journey, is inscribed above this . </P> <P> Adjacent to the Dome of the Rock, the Ottomans built the free - standing Dome of the Prophet in 1620 . Large - scale renovation was undertaken during the reign of Mahmud II in 1817 . </P> <P> In a major restoration project undertaken in 1874--75 during the reign of the Ottoman Sultan Abdülaziz, all the tiles on the west and southwest walls of the octagonal part of the building were removed and replaced by copies that had been made in Turkey . </P> <Ul> <Li> <P> View from the north, Francis Bedford (1862) </P> </Li> <Li> <P> West front in 1862 . By this date many of the 16th century tiles were missing . </P> </Li> <Li> <P> Interior showing mosaic decoration (1914) </P> </Li> <Li> <P> Tiled façade (2013) </P> </Li> <Li> <P> Interior showing rock (1915) </P> </Li> </Ul>

What is the top of the dome of the rock made of