Lower-quality stones, which are naturally greyish, are often heat-treated to darken and turn them into black diamonds. Gems made this way are significantly less expensive than naturally black ...

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 ...

That place is in Central America. Antigua, Guatemala is the ultimate hidden gem for Black travelers. Here’s what makes it ...