Here’s a look at some of the most expensive gemstones in the world. Topping the list is the Pink Star Diamond, a 59.6-carat oval-cut pink diamond that shattered records when it sold for $71.2 ...

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 ...

This gem is one of the rarest in the world, which explains its high price ... The 18.04-carat Rockefeller Emerald was the most expensive emerald per carat ever sold — at $5.51 million, or $305,500 per ...