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Oklahoma Has the Only Active Diamond Mine in the U.S. — and It’s Open to the Public

While most people think of diamonds coming from Africa or Canada, Oklahoma is home to a little-known diamond source.

• The state’s Ouachita Mountains contain ancient volcanic pipes that once carried diamonds to the surface.
• In fact, diamonds have been discovered in the region for centuries, but on such a small scale that few know about it.
• Unlike Arkansas’ Crater of Diamonds State Park, Oklahoma’s sites aren’t commercialized — meaning locals and adventurous rock hunters can still stumble upon these natural gems today.

This hidden geological secret makes Oklahoma one of only a handful of states in America with a natural diamond history.