content: The mosque includes extensive colored glass in its facade, and displays other traditional elements such as the Panj Kāse ("five concaved") design. It is named in popular culture as the Pink Mosque,[1] due to the usage of considerable pink color tiles for its interior design.[2]  https://en.wikipedia.org/wiki/Nasir_ol_Molk_Mosque So I think some of those colors are coming from the stained glass onto the pink marble. And the saturation of the photo has been pushed.