What is the deepest gemstone on Earth?

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In Virgin Valley, Nevada, it’s possible to spend an afternoon digging for rare black fire opals, while visitors to Coalinga, California, can search the earth for pieces of the state’s official gemstone, benitoite. At Arkansas’ Crater of Diamonds State Park, would-be sleuths pay just $10 to search for the world’s most sought-after stones.

Each of these outlets requires little more than hand tools, but most gemstones originate between 3 to 25 miles (5 to 40 kilometers) undergroundand some extend much deeper.

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