Following is a transcript of the video. 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.

Lightning Ridge is the only place in the world where the black opal is found. This frontier town, 350 mi/565 km northwest of Sydney in New South Wales, is also the best place to buy this rare gem ...

CSIRO and a consortium of Australian Opal miners (Opal Producers Australia Limited) have unveiled the world's first automated device to grade opals using image analysis, at the 2009 National Council ...

Lightning Ridge Famous opal mining town Although there are lots of opal mining towns in Australia there are four which have become household names - Coober Pedy, Andamooka, White Cliffs and Lightning ...

Unusually colorful fossils found in Australia belong to a stunning new species of plant-eating dinosaur, scientists report today in the Journal of Vertebrate Paleontology. The remains not only belong ...