A special edition €20 gold proof collector's coin has been launched today by the Central Bank.

The coin, which features a Celtic high cross, is one of the smallest coins in the world at 11mm in diameter and 0.5g in weight.

The €20 coin, which costs €40, has an issue limit of 12,000 units.

It shows the high cross in a monastic setting with an Irish round tower.

The collector's item was designed by Irish artist Thomas Ryan.