 Sumerian masons and jewelers knew and made use of alabaster (calcite), ivory, iron, gold, silver, carnelian, and lapis lazuli.Evidence for imports from the Indus to Ur can be found from around 2350 BCE.Various objects made with shell species that are characteristic of the Indus coast, particularly "Trubinella Pyrum" and "Fasciolaria Trapezium", have been found in the archaeological sites of Mesopotamia dating from around 2500-2000 BCE.