Decorative stone til should be distinguished from mosaic granite, where forms are made of great numbers of tiny irregularly positioned tesserae in a single colour, usually of glass or sometimes ceramic The earliest evidence of stone tile is the discovery of stone tile in the Elamite Temple at Chogha Zanbil, dated to the 13th century BCE. Stone tile was used to make low reliefs in Ancient Mesopotamia, most famously the Ishtar Gate of Babylon (ca. 575 BCE), now partly reconstructed in Berlin, with sections elsewhere. Mesopotamian craftsmen were imported for the palaces of the Persian Empire such as Persepolis .