Colombia produces the world’s most expensive emeralds. The highest-quality stones can be worth tens of thousands of dollars per carat. Miners have fought over these treasures for centuries, but in the ...

President Donald Trump has threatened tariffs against Colombia amid a deportation fight. Here's a look at what could see price increases.

So what happens when foreign investors take over a $150 million industry? And can local miners gain a piece of it back? More from So Expensive Colombia produces the world's most expensive emeralds.