This vibrant 7-cent stamp from Australia, issued in 1983, features a stunning depiction of agate, one of the most colorful and banded varieties of chalcedony. The design highlights the intricate concentric layers of the gemstone, showcasing its natural hues of red, green, and yellow. Part of a series celebrating Australian minerals and gemstones, the stamp reflects the nation’s rich geological diversity and artistry in philatelic design. A favorite among thematic collectors of minerals, geology, and natural wonders.