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California gems outshine Hollywood stars.
Colored Stone 1992 Jan; 5(1):298-300
California is, or at least should be, as well known for its selection of fine gem materials as for its warm climate, athletic teams, and famous sights and attractions. The value of 1990 California natural gem material production was about $2.4 million, according to the most recent statistics released by the U.S. Bureau of Mines. Only Arizona produces a greater variety of gem materials than California.
OP; Journal Article
Issue of Publication
AZ; CA; DC
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division