NIOSHTIC-2 Publications Search
U.S. gem production rises.
Colored Stone 1992 5(5):1
Production of natural gemstones in the United States increased 60 pct to $84.4 million in 1991, according to estimates from the U.S. Bureau of Mines. The value of U.S. synthetic and simulated gem material production dropped, however, to $17.7 million, about 14 pct less than in 1990. In 1991, each of the 50 states produced at least $1,000 worth of gem materials, although 10 states accounted for about 93 pct of the total value.
OP; Journal Article
Issue of Publication
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division