The correct answer is option 2: Korkai. Korkai was an important Pandya port that was well-known for its pearls in Sangam poems and Greek accounts. The Sangam poems were a collection of Tamil literature from the ancient Sangam period, which lasted from 200 BCE to 300 CE. These poems often mentioned the significance of Korkai as a port and its association with pearl fishing.

Korkai was also mentioned in Greek accounts, further highlighting its importance as a trading hub in ancient times. The Greeks had established trade contacts with various parts of India, including the Pandya kingdom. These accounts provide additional evidence of Korkai`s prominence as a pearl trading center in the region.

It is important to note that the other options listed - Muchiri, Puhar, and Arikamedu - were also important ports in ancient India, but they were not specifically celebrated for their pearls in Sangam poems and Greek accounts. Therefore, the correct answer remains option 2, Korkai.