This sarcastic description of the prince of Tyre's greatness and pride sets him up for his fall, similar to the fall of humanity (Genesis 3). Like Adam, the king of Tyre's supposedly blameless state was temporary and ended abruptly when evil was found in him. His wealth and dishonest trade led him to violence (compare Ezekiel 26:17).
Someone who claimed to be greater than Adam could experience a similar fall from favor and be banished from the mountain of God, the place of God's favor. The prince of Tyre's God-given beauty and wisdom were corrupted by his pride, leading to disaster and revealing his true nature.