precious opal

noun

1. any opal having a play of colors, used as a gemstone.

Example Sentences

“I took my camera and lenses, and my DJI drone, along with a number of bottles of Nevada precious opal.”

From Los Angeles Times

"When our state's inland sea evaporated millions of years ago, it provided a unique silica-rich environment for the creation of precious opal. It is these exceptional conditions that created the Fire of Australia."

From BBC

Highly acidic fluids dissolved silica from quartz-rich sandstones that then later precipitated as precious opal.

From BBC

Most gem-stones are harder than quartz, though precious opal, turquoise, moonstone and sphene are inferior to it in hardness.

From Project Gutenberg

The settlement had weathered seasons of dearth, and had existed on the merest traces of precious opal before; but this one had lasted longer, and had tried everybody's patience and capacity for endurance to the last degree.

From Project Gutenberg