These days, there are many choices of expensive green gemstones ... that looks like jade to a blueish green that resembles ...

When you think of expensive gemstones, what comes to mind? Most people think of the Big Four ... The mineral is often confused with jade. Translucent and transparent Grandidierite stones are ...

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 ...