Australia is the world's leading producer of which gemstone?

• A. Opal
• B. Diamond
• C. Ruby
• D. Emerald

Answer: (A)

Opal is the gemstone Australia leads the world in producing. This comes from Australia’s extensive opal-bearing basins and famous mining towns such as Coober Pedy, Lightning Ridge, Andamooka, and White Cliffs, which together supply the vast majority of opals used in jewelry. Precious opal, with its play of color, is especially linked to Australian sources, reinforcing why opal stands as the country’s top gem by production. Opal is a mineraloid formed when silica-rich solution fills voids in rocks and later hardens; the unique play of color results from the diffraction of light through tiny silica spheres. While diamonds, rubies, and emeralds are mined in many places around the world, Australia’s dominant role is in opal.