State Gemstone of California: Benitoite

Information about Benitoite, the official state gemstone of California.

From the California State Library: Benitoite
Benitoite was designated as the official State Gemstone in 1985. Sometimes called the " blue diamond", it was first discovered near the headwaters of the San Benito River from which it derived its name. The gem is extremely rare and ranges in color from a light transparent blue to dark, vivid sapphire blue, and occasionally it is found in a violet shade.

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