Opal

Opal is amorphous silica — not a crystal in the strict sense, but a hardened silica gel. It forms in sedimentary rock when silica-rich water percolates through sandstone, fills cavities, and slowly evaporates over millions of years. What makes precious opal remarkable is its internal structure: regular arrays of stacked silica spheres of uniform size that diffract white light into its component spectrum. The size of the spheres determines the color — smaller spheres produce blue and green, larger ones red and orange. Australia produces over 90% of the world's precious opal, primarily from Lightning Ridge, Coober Pedy, and Mintabie.

Opal is not one color — it is all of them, in motion. Blue, green, orange, red, and violet appear and shift as the stone moves through light. No two opals share the same color arrangement. It is a stone that rewards looking — patient attention reveals something new each time. For people who show differently in different contexts, who carry more than they immediately reveal. Wear it when you want something that moves with you.