Through post offices and banks, nearly three million, or 2.975 million, of the new designs will be making its way into people's pockets and tills around the United Kingdom this week.
In celebration of the King's love of the natural environment and conservation, the "tails" side of the coins features two British bees, while the "heads" side features the official coin image of the monarch.
It comes after banknotes featuring the King's image were released in June.
The new coins will continue to circulate alongside ones displaying the image of Queen Elizabeth II, which will be replaced over time as they become damaged or worn.
Seven other coins - ranging from the 1p to the £2 - have also been inspired by nature to reflect the King's commitment to the environment.
The designs, which will be introduced in line with demand, are the 1p showing a hazel dormouse, the 2p red squirrel, the 5p oak tree leaf, 10p capercaillie grouse, 20p puffin, and the £2 with the national flowers - rose, daffodil, thistle and shamrock.
The 50p, which features an Atlantic salmon, was made available in November of last year.
The £1 bee coin and the 2p red squirrel coin were the top choices according to a public survey conducted by the Royal Mint.