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Inside the emerald mines that make Colombia a global giant of the green gem

05:05
Rocks retrieved from a mine in Muzo, Colombia, show some of what makes the country the biggest producer of high-value emeralds. (Carlos Saavedra for NPR)
Rocks retrieved from a mine in Muzo, Colombia, show some of what makes the country the biggest producer of high-value emeralds. (Carlos Saavedra for NPR)

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