As with all commemorative coins released by the Royal Mint, coins in the 2021 Sovereign family are available in three different striking standards: Proof, Brilliant Uncirculated (BU) and Bullion. You can choose the fine detail of the Proof 2021 Sovereign, the accessibility of the BU piece or the investment potential in the Bullion option. As they have the highest quality finish and are issued in the smallest numbers, the 2021 Gold Proof Sovereigns will be the most sought after.