Australia has two mints, the Royal Australian Mint (which also makes the country's circulating coinage) and the Perth Mint, which are both very active in the bullion coinage space; coins issued by them are legal tender.
Additionally, there are private issuers of bullion which is not legal tender and is targeted at investors and not at coin collectors - such as this one.
The Mint says about this Diwali 1oz Silver Gilded Medallion:
Symbolising the victory of light over darkness, Diwali is one of the world’s great festive occasions. Observed by millions of people around the globe, it is celebrated during October or November with lights in the form of candles and lamps, fireworks, family feasts and the exchange of many gifts.
Portraying Lakshmi, the goddess of wealth and prosperity, and Ganesh, the elephant headed god of good fortune, the medallion’s reverse artistry includes 24-carat gold gilding on selected elements, including the deities’ ornate headdresses and neckpieces. Also symbolic of Diwali, the obverse features a "rangoli" inspired pattern comprising diya (lamps) and lotus flower motifs.