In 2010 to celebrate the Royal Engagement of Prince William and Kate Middleton, the Royal Mint released a very Limited Issue Royal Engagement £5 Five Pound Gold Proof Coin struck in solid 22 Carat Gold.
The reverse depicts a portrait of both William and Kate and the obverse has the stunning portrait of Her Majesty Queen Elizabeth II by Ian Rank Broadley.
These legal tender coins have been struck to proof quality using specially prepared dies and highly polished blanks.