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.
A translucent opalized fossil turtle tail bone, donated to the Australian Opal Center by opal miners Graeme and Christine Thompson. Cloaked in white dust and surrounded by expansive plains, the town ...
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