The minaret, constructed of sandstone, is one of the most famous in the western Islamic world along with the contemporary Giralda of Seville and the Hassan Tower of Rabat.[67][68] It was originally covered with Marrakshi pink plaster, but in the 1990s, experts opted to expose the original stone work and removed the plaster. The spire includes gilded copper balls, decreasing in size towards the top, a traditional style of Morocco.[69]