The recognizable native animal is depicted in high relief on the coin, snoozing on a branch among a bunch of eucalyptus leaves. The koala and edge of the coin have been gilded in stunning 22-carat pink gold with painstaking attention to detail. In addition to the KOALA and The Perth Mint's 'P' mintmark, the coin's weight, purity, and issue year can be found on the reverse. Featuring new designs every year, The Australian Koala Coin Series is a favorite among coin collectors. Koalas are gentle and sleepy marsupials native to Australia's eucalyptus forests, where they spend most of their time either napping or munching on gum leaves.