Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. But mining black opal isn't easy. After investing tens of thousands of ...

The shinier the pearl, the better. Black opal is one of the rarest gemstones in the world, sought after for its seemingly infinite display of colors, compared to common opal, which is usually one ...

Global demand for opals is soaring, pushing up prices of the gemstones. As the 40ft (12m) drill rattles down through the red dirt, miner Craig Stutley makes a statement that sounds a lot like what ...

A new technique employing monochromatic light improves the study of internal structures in materials affected by light ...