The clocks are topped by a spire with a golden crescent at the top. The spire has an eight-story glass-covered base (The Jewel) which belongs to a scientific center having its own small exhibition, another observation deck at and a prayer floor in . The highest floor in The Jewel is the Control Tower Floor, which was planned to be used for controlling air traffic in the sky above Mecca (mainly helicopters as airplanes are not allowed near Mecca). However, this was skipped for technical reasons and the future usage is not clear yet. Above from The Jewel the spire has only technical installations for sound, light and other infrastructure and eventually the last viewing deck and the crescent above it. The crescent has two regular floors with living areas and a few service floors and rooms.