Jackson, from Bristol, won the opportunity to design the coin after entering a BBC Blue Peter competition, seeing off more than 17 000 other entries.
The coin, which features a high-jumper, is the first in a series of 29 50p coins that will appear in circulation next year to celebrate the London 2012 Olympics.
Jackson says, ‘I chose the high-jump because I’d watched it on TV before and thought it looked fun. It was amazing to visit the Royal Mint and see my picture turned into a coin. I can’t wait to see it in my pocket money.’