A Gem Good Time!

A wide selection of rocks and minerals have made Lake County a hotbed for rockhounds around the world. The most coveted find is the Lake County Diamond, a lovely crystal-like stone of the quartz family that is formed by volcanic processes and found nowhere else in the world.

We're Erupting with Great Finds!

You’ll also find an abundance of obsidian, onyx, agate, jasper, chert, quartz, travertine, jade, petrified wood and clamshell fossils – many of which are the result of the Clear Lake Volcanic Field. Be sure to visit the Lake County Historic Courthouse Museum, where you’ll see a 94-carat faceted Lake County Diamond!


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