Australia 1 Dollar 2013 Treasures of the World Garnet Silver Coin April 5, 2025 admin Type of Uncirculated Coins. Metal: 999 Silver (Garnet Chips in the Round Cut). Weight: 31.1035 grams. Diameter: 40.6 mm. Thickness: 4.5 mm. Limited Edition: 7500 Units Only. Original Packaging and Certificates.