Opals are some of the most unique gemstones on Earth. They range from milky white to fiery red and deep blue-green, and all have a kaleidoscope of shimmering colors within, called play-of-color. Here ...

Cloaked in white dust and surrounded by expansive plains, the town of Lightning Ridge produces the bulk of the world’s precious black opal. This rare gemstone, prized for its dazzling play of color, ...