The Australian one-ounce gold piece (abbreviated as 1 oz and designated with Au for "gold") is a bullion coin format. Uniquely, in Australia there are two mints authorised to strike legal tender: the Royal Australian Mint (which also makes the country's circulating coinage) and the Perth Mint which only makes collector and bullion coins, as well as other bullion products.
Both mints endeavour to create coins with attractive designs, and to introduce new designs and themes often, in order to raise the numismatic value of the coins over the value of previous metal used.
This design is the first issue in a premium bullion coin series called Wildflowers of Australia, and features the Waratah.
The Mint says about it:
Australia’s iconic wildflower, the Waratah, is beautifully presented in the Royal Australian Mint’s most recent investment coin series - Wildflowers of Australia. The gold and silver coins feature an intricate design that showcases one of Australia’s most recognisable and striking flowers, endemic to southeastern Australia. Both coins will be sought after by precious metal investors and entry-level collectors, with the gold coin featuring three levels of security for added protection. | 
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