What led to the belief that there were cities trading with gemstones? 1-2 sentences

The discovery and excavation of ancient cities, such as Ur and Mohenjo-daro, revealed the presence of jewelry, artifacts, and gemstones, suggesting that these cities were involved in trade and commerce related to gemstones.

The belief that cities were trading with gemstones likely stemmed from historical evidence such as archaeological findings, ancient writings, and accounts of early traders and explorers who encountered gemstones in various regions.

The belief that there were cities trading with gemstones likely stemmed from historical accounts, archaeological discoveries, and evidence of ancient trading networks that featured gemstones as valuable commodities.