Final answer:
A common trade item exported from the Indus Valley to Mesopotamia was precious stones, such as lapis lazuli and carnelian, as well as marine shells from the Indian Ocean.
Step-by-step explanation:
A common trade item exported from the Indus Valley to Mesopotamia was precious stones. Cuneiform tablets from Mesopotamia document the importation of precious stones such as lapis lazuli and carnelian from the Indus Valley. Additionally, marine shells from the Indian Ocean were also imported from the region.
Merchants from the Indus Valley traveled by sea across the Indian Ocean and over the Iranian plateau to trade these goods.