Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones ... if you wanted to rock up here and be serious, it'd probably ...

This is when the real value of the gem is determined. There's a huge demand for black opal, with lack of supply driving up the price. Black opal costs from $1,000 a carat to tens of thousands of ...

When you're in a really good pocket, see how these nobbies are sitting close ... price of black opal. We can barely keep up with the demand at the moment. As soon as you find a gem-quality stone ...